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All questions of Animals & Plants for CTET & State TET Exam
Which of the following is used for control and prevention of the spread of animal diseases?- a)Vaccination
- b)Bio-security
- c)Hygiene
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Which of the following is used for control and prevention of the spread of animal diseases?
a)
Vaccination
b)
Bio-security
c)
Hygiene
d)
All of the above
|
Code Nation answered |
The correct option is all of these.
Key Points
The chances of spread of animal diseases are greatly reduced if the following measures are taken:
- Maintaining hygiene on the farm.
- Following vaccination schedule.
- Isolating sick and newly arrived animals.
- Blood and urine examination of animals for diagnosis of disease.
- Treatment of affected animals.
- Control of vectors.
- Proper disposal of animal waste and carcass.
- Following bio-security measures.
Which of the following is true about forests?- a)It is a system comprising various plants only
- b)In it, trees form the uppermost layer followed by herbs, and the lowest layer of vegetation is made of shrubs
- c)Forests keep on growing and changing but they can not regenerate on their own
- d)Forests are the lifeline for the forest-dwelling communities
Correct answer is option 'B'. Can you explain this answer?
a)
It is a system comprising various plants only
b)
In it, trees form the uppermost layer followed by herbs, and the lowest layer of vegetation is made of shrubs
c)
Forests keep on growing and changing but they can not regenerate on their own
d)
Forests are the lifeline for the forest-dwelling communities
|
Aaditya Basu answered |
Understanding Forest Structure
Forests are complex ecosystems that consist of diverse plant species and layers of vegetation. The correct answer, option 'B', highlights the hierarchical structure of forests, which is essential for understanding their ecology.
Layered Vegetation
- Uppermost Layer (Canopy):
- This layer is primarily made up of tall trees that form a dense cover. It plays a crucial role in absorbing sunlight and provides habitat for various wildlife.
- Middle Layer (Understory):
- Below the canopy, the understory consists of smaller trees and young saplings that thrive in the shade of the upper layer. This layer supports various species of birds and insects.
- Lowest Layer (Forest Floor):
- The forest floor is where shrubs, herbs, and ground cover plants grow. This layer is vital for nutrient recycling and provides habitat for small animals and insects.
Forest Dynamics
- Growth and Change:
- Forests are dynamic systems that continuously grow and change over time. They undergo processes like succession, where different plant species replace one another as the ecosystem matures.
- Regeneration Ability:
- Contrary to option 'C', forests can regenerate naturally after disturbances such as fires or logging, given that the conditions are favorable for growth.
Importance for Communities
- Lifeline for Communities:
- Forests provide resources like wood, food, and medicinal plants to forest-dwelling communities, supporting their livelihoods and cultural practices.
In summary, option 'B' correctly describes the structured layers of vegetation in forests, emphasizing their ecological complexity and importance to both biodiversity and human communities.
Forests are complex ecosystems that consist of diverse plant species and layers of vegetation. The correct answer, option 'B', highlights the hierarchical structure of forests, which is essential for understanding their ecology.
Layered Vegetation
- Uppermost Layer (Canopy):
- This layer is primarily made up of tall trees that form a dense cover. It plays a crucial role in absorbing sunlight and provides habitat for various wildlife.
- Middle Layer (Understory):
- Below the canopy, the understory consists of smaller trees and young saplings that thrive in the shade of the upper layer. This layer supports various species of birds and insects.
- Lowest Layer (Forest Floor):
- The forest floor is where shrubs, herbs, and ground cover plants grow. This layer is vital for nutrient recycling and provides habitat for small animals and insects.
Forest Dynamics
- Growth and Change:
- Forests are dynamic systems that continuously grow and change over time. They undergo processes like succession, where different plant species replace one another as the ecosystem matures.
- Regeneration Ability:
- Contrary to option 'C', forests can regenerate naturally after disturbances such as fires or logging, given that the conditions are favorable for growth.
Importance for Communities
- Lifeline for Communities:
- Forests provide resources like wood, food, and medicinal plants to forest-dwelling communities, supporting their livelihoods and cultural practices.
In summary, option 'B' correctly describes the structured layers of vegetation in forests, emphasizing their ecological complexity and importance to both biodiversity and human communities.
A bird that makes a nest hanging from the branch of a small tree or shrub is- a)sun bird
- b)crow
- c)barbet
- d)Indian robin
Correct answer is option 'A'. Can you explain this answer?
a)
sun bird
b)
crow
c)
barbet
d)
Indian robin
|
|
Code Nation answered |
Concept:
- Birds build nests tolay their eggs and incubate their younger ones.
- Different birds build nests at different places, some on ground level, some high up on the tree.
- Different birds use different techniques and different materials to build their nests.
Explanation:
Sunbird:
- They are tiny birds.
- These are usually seen during dawn.
- They make a tiny nest hanging from the branch of a small tree or shrub.
- Nest is usually made up of:
- Hair
- Grass
- Dry leaves
- Cloth pieces.
Additional Information
Barbet:
- It is a tropical bird constituting the family Capitonidae.
- Barbets are named for the bristles at the bases of their stout, sharp bills.
- They are big-headed, short-tailed birds, 9–30 cm long, greenish or brownish, with splashes of bright colours or white.
- The distribution of the family spans Central America to northern South America; sub-Saharan Africa; and Southeast Asia, eastward only to Borneo and Bali.
- All are non-migratory.
- Barbets sit stolidly in treetops when not feeding oninsects, lizards, birds’ eggs, fruit, and berries.
- Some climb like woodpeckers; all fly weakly.
- The nest is a hole, dug with the beak, high up in a rotting tree or in a termite nest.
Koyel:
- It is a crow size bird, with a similar appearance.
- It does not make its own nest.
- Crow makes a nest for it.
Indian robin:
- It makes its nest on the roadside between stones or grasslands.
- It is covered with twigs, cotton, and wool.
Tailorbird:
- It is a small bird with a long tail.
- It makes its nest by switching the two leaves together.
Choose the correct option from the given features of desert plants. (A) Leaves of some plants take the shape of spines. (B) Photosynthesis in cactus plant is usually carried out by leaves. (C) Roots of most desert plants go very deep into the soil for absorbing water.- a)Only (A)
- b)(A) and (B)
- c)(A) and (C)
- d)(B) and (C)
Correct answer is option 'C'. Can you explain this answer?
Choose the correct option from the given features of desert plants.
(A) Leaves of some plants take the shape of spines.
(B) Photosynthesis in cactus plant is usually carried out by leaves.
(C) Roots of most desert plants go very deep into the soil for absorbing water.
a)
Only (A)
b)
(A) and (B)
c)
(A) and (C)
d)
(B) and (C)
|
Gitanjali Desai answered |
Features of Desert Plants
Desert plants have adapted uniquely to survive in harsh environments characterized by extreme temperatures and limited water availability. Let's analyze the given statements:
Statement A: Leaves of some plants take the shape of spines.
- This statement is true.
- Many desert plants, like cacti, have modified their leaves into spines to minimize water loss through transpiration.
- Spines also provide protection from herbivores.
Statement B: Photosynthesis in cactus plant is usually carried out by leaves.
- This statement is false.
- In cacti, the leaves are reduced to spines, and photosynthesis is primarily conducted by the stems, which are green and capable of photosynthesis.
- This adaptation helps the plant conserve water while still performing vital functions.
Statement C: Roots of most desert plants go very deep into the soil for absorbing water.
- This statement is true.
- Many desert plants have extensive root systems that can reach deep into the ground to access moisture that is unavailable to surface-level plants.
- Some plants also have shallow roots that spread widely to capture rainwater quickly when it does occur.
Conclusion
Given the analysis, the correct answer is option 'C' because:
- Statements A and C are true, while statement B is false.
- Therefore, the option that includes both true statements (A and C) is the right choice.
Understanding these adaptations is crucial for appreciating how desert flora has evolved to thrive in extreme conditions.
Desert plants have adapted uniquely to survive in harsh environments characterized by extreme temperatures and limited water availability. Let's analyze the given statements:
Statement A: Leaves of some plants take the shape of spines.
- This statement is true.
- Many desert plants, like cacti, have modified their leaves into spines to minimize water loss through transpiration.
- Spines also provide protection from herbivores.
Statement B: Photosynthesis in cactus plant is usually carried out by leaves.
- This statement is false.
- In cacti, the leaves are reduced to spines, and photosynthesis is primarily conducted by the stems, which are green and capable of photosynthesis.
- This adaptation helps the plant conserve water while still performing vital functions.
Statement C: Roots of most desert plants go very deep into the soil for absorbing water.
- This statement is true.
- Many desert plants have extensive root systems that can reach deep into the ground to access moisture that is unavailable to surface-level plants.
- Some plants also have shallow roots that spread widely to capture rainwater quickly when it does occur.
Conclusion
Given the analysis, the correct answer is option 'C' because:
- Statements A and C are true, while statement B is false.
- Therefore, the option that includes both true statements (A and C) is the right choice.
Understanding these adaptations is crucial for appreciating how desert flora has evolved to thrive in extreme conditions.
Which of the following is NOT true about Cells?- a)Nucleus is separated from cytoplasm by a nuclear membrane.
- b)Animal cells differ from plants cells in having an additional layer around the cell membrane termed cell wall.
- c)Cells were first observed in cork by Robert Hooke in 1665.
- d)Coloured bodies called plastids are found in the plant cells only.
Correct answer is option 'B'. Can you explain this answer?
Which of the following is NOT true about Cells?
a)
Nucleus is separated from cytoplasm by a nuclear membrane.
b)
Animal cells differ from plants cells in having an additional layer around the cell membrane termed cell wall.
c)
Cells were first observed in cork by Robert Hooke in 1665.
d)
Coloured bodies called plastids are found in the plant cells only.
|
Ayush Nair answered |
Understanding Cell Structure
Cells are the fundamental units of life, and understanding their structure is crucial in biology. Among the statements provided, option 'B' is incorrect regarding cell characteristics.
Explanation of Option B
- Animal and Plant Cell Differences:
- Animal cells do not have a cell wall; instead, they are surrounded by a flexible cell membrane.
- Plant cells, on the other hand, have a rigid cell wall made of cellulose, which provides structure and protection.
True Statements
- Nucleus and Cytoplasm:
- The nucleus is indeed separated from the cytoplasm by a nuclear membrane, which regulates the exchange of materials between the nucleus and the cytoplasm.
- Discovery by Robert Hooke:
- Cells were first observed in cork by Robert Hooke in 1665. He coined the term "cell" after the small box-like structures he saw under a microscope.
- Plastids in Plant Cells:
- Plastids, which are colored bodies involved in photosynthesis and storage, are primarily found in plant cells. They include chloroplasts, which are responsible for green pigmentation and energy capture.
Conclusion
In summary, option 'B' is incorrect because it misrepresents the presence of the cell wall, which is characteristic of plant cells, not animal cells. Understanding these distinctions is essential for grasping cell biology concepts.
Cells are the fundamental units of life, and understanding their structure is crucial in biology. Among the statements provided, option 'B' is incorrect regarding cell characteristics.
Explanation of Option B
- Animal and Plant Cell Differences:
- Animal cells do not have a cell wall; instead, they are surrounded by a flexible cell membrane.
- Plant cells, on the other hand, have a rigid cell wall made of cellulose, which provides structure and protection.
True Statements
- Nucleus and Cytoplasm:
- The nucleus is indeed separated from the cytoplasm by a nuclear membrane, which regulates the exchange of materials between the nucleus and the cytoplasm.
- Discovery by Robert Hooke:
- Cells were first observed in cork by Robert Hooke in 1665. He coined the term "cell" after the small box-like structures he saw under a microscope.
- Plastids in Plant Cells:
- Plastids, which are colored bodies involved in photosynthesis and storage, are primarily found in plant cells. They include chloroplasts, which are responsible for green pigmentation and energy capture.
Conclusion
In summary, option 'B' is incorrect because it misrepresents the presence of the cell wall, which is characteristic of plant cells, not animal cells. Understanding these distinctions is essential for grasping cell biology concepts.
Which of the following represents a set of cell organelles found in animal cell?- a)Cell membrane, cytoplasm, nucleus, vacuole
- b)Cell membrane, cell wall, cytoplasm, nucleus
- c)Cell membrane, chloroplast, cytoplasm, nucleus
- d)Cell membrane, cell wall, cytoplasm, vacuole
Correct answer is option 'A'. Can you explain this answer?
Which of the following represents a set of cell organelles found in animal cell?
a)
Cell membrane, cytoplasm, nucleus, vacuole
b)
Cell membrane, cell wall, cytoplasm, nucleus
c)
Cell membrane, chloroplast, cytoplasm, nucleus
d)
Cell membrane, cell wall, cytoplasm, vacuole
|
Yash Menon answered |
Overview of Animal Cell Organelles
Animal cells contain various organelles that perform essential functions for the cell's survival and operation. Understanding these organelles is crucial for studying cellular biology.
Correct Option: A
The correct answer is option 'A', which includes:
Why Other Options are Incorrect
Conclusion
In summary, option 'A' correctly lists organelles found in animal cells, emphasizing the fundamental components that contribute to the functionality and integrity of these cells. Understanding these organelles is vital for comprehending how animal cells operate and interact with their environment.
Animal cells contain various organelles that perform essential functions for the cell's survival and operation. Understanding these organelles is crucial for studying cellular biology.
Correct Option: A
The correct answer is option 'A', which includes:
- Cell Membrane: This is a protective barrier that surrounds the cell, regulating the entry and exit of substances.
- Cytoplasm: A gel-like substance within the cell, where various organelles are suspended and biochemical processes occur.
- Nucleus: The control center of the cell, housing DNA and regulating cell activities such as growth and reproduction.
- Vacuole: Although more prominent in plant cells, animal cells also have small vacuoles that store substances and help maintain cellular homeostasis.
Why Other Options are Incorrect
- Option B: Includes a cell wall, which is absent in animal cells as they only have a cell membrane.
- Option C: Contains chloroplasts, which are involved in photosynthesis and found in plant cells, not animal cells.
- Option D: Again includes a cell wall, which is not a feature of animal cells.
Conclusion
In summary, option 'A' correctly lists organelles found in animal cells, emphasizing the fundamental components that contribute to the functionality and integrity of these cells. Understanding these organelles is vital for comprehending how animal cells operate and interact with their environment.
Which of the following insects live in a group and have specific role allocation?- a)Honeybees, Ants, Spiders
- b)Wasps, Termites, Ants
- c)Ants, Mosquitoes, Spiders
- d)Honeybees, Housefly, Termites
Correct answer is option 'B'. Can you explain this answer?
Which of the following insects live in a group and have specific role allocation?
a)
Honeybees, Ants, Spiders
b)
Wasps, Termites, Ants
c)
Ants, Mosquitoes, Spiders
d)
Honeybees, Housefly, Termites
|
|
Rajdeep Datta answered |
Explanation:
Group Living Insects with Role Allocation:
- Wasps: Wasps live in colonies with specific roles allocated to different members such as queens, workers, and drones.
- Termites: Termites live in large colonies with a caste system that includes workers, soldiers, and the queen.
- Ants: Ants also live in colonies with clearly defined roles for worker ants, soldier ants, and the queen.
Explanation of Incorrect Options:
- Option A: Honeybees and ants are correct choices, but spiders do not typically live in groups with specific role allocation.
- Option C: Ants fit the criteria, but mosquitoes and spiders do not exhibit this behavior.
- Option D: Honeybees and termites have specific role allocation, but houseflies do not live in groups with specific roles.
Conclusion:
Among the choices given, option B (Wasps, Termites, Ants) is the correct answer as all three insects live in groups with specific role allocation within their colonies.
Group Living Insects with Role Allocation:
- Wasps: Wasps live in colonies with specific roles allocated to different members such as queens, workers, and drones.
- Termites: Termites live in large colonies with a caste system that includes workers, soldiers, and the queen.
- Ants: Ants also live in colonies with clearly defined roles for worker ants, soldier ants, and the queen.
Explanation of Incorrect Options:
- Option A: Honeybees and ants are correct choices, but spiders do not typically live in groups with specific role allocation.
- Option C: Ants fit the criteria, but mosquitoes and spiders do not exhibit this behavior.
- Option D: Honeybees and termites have specific role allocation, but houseflies do not live in groups with specific roles.
Conclusion:
Among the choices given, option B (Wasps, Termites, Ants) is the correct answer as all three insects live in groups with specific role allocation within their colonies.
Consider the following main functions of plants root:
A. To produce and store food
B. To give strength and support to the plant
C. To transport water and minerals from roots to other parts of plant
The main function(s) of the stem is/are:
- a)Only B
- b)Only B and C
- c)Only A and B
- d)A, B and C
Correct answer is option 'B'. Can you explain this answer?
Consider the following main functions of plants root:
A. To produce and store food
B. To give strength and support to the plant
C. To transport water and minerals from roots to other parts of plant
The main function(s) of the stem is/are:
a)
Only B
b)
Only B and C
c)
Only A and B
d)
A, B and C
|
Tom Tattle answered |
The correct answer is Only B and C.
Key Points
The main function(s) of the stem include:
- To give strength and support to the plant.
- To transport water and minerals from roots to other parts of the plant.
- The stem of a plant serves as a structural support, holding up leaves, flowers, and fruits.
- It provides stability to the plant and keeps it upright.
- Additionally, the stem contains vascular tissues, such as the xylem and phloem, which are responsible for the transport of water, minerals, and nutrients from the roots to various parts of the plant, including leaves, flowers, and fruits.
Additional Information
- Plants serve various important roles in the ecosystem and interact with their surroundings in multiple ways.
- Plants play a crucial role in preventing soil erosion.
- The root systems of plants help hold the soil in place, reducing the risk of erosion caused by wind or water.
- By anchoring themselves in the ground, plants bind the soil particles together, making it less susceptible to being washed away.
- Furthermore, plants provide us with seeds, many of which are edible and serve as a valuable food source.
- They contain the necessary nutrients and genetic material for the growth of new plants.
With reference to cell parts, cytoplasm:- a)Porous and allows the movement of substances or substances both in and out.
- b)The outer surface of the cell of onion is.
- c)Between the nucleus and the cell membrane is a jelly-like substance.
- d)Generally spherical and located in the center of the cell.
Correct answer is option 'C'. Can you explain this answer?
a)
Porous and allows the movement of substances or substances both in and out.
b)
The outer surface of the cell of onion is.
c)
Between the nucleus and the cell membrane is a jelly-like substance.
d)
Generally spherical and located in the center of the cell.
|
Meera Desai answered |
Understanding Cytoplasm
Cytoplasm is a vital component of a cell, playing a crucial role in cellular functions. It is the jelly-like substance that fills the space between the cell membrane and the nucleus, and it houses various organelles necessary for the cell's operations.
Key Features of Cytoplasm
- Jelly-like Consistency: Cytoplasm has a semi-fluid consistency, which allows it to provide a medium for biochemical reactions to occur. This gel-like nature helps maintain the structure of organelles within the cell.
- Location: It is found between the cell membrane and the nucleus, acting as a buffer zone that supports and protects the organelles while facilitating communication between them.
- Storage and Transport: Cytoplasm serves as a storage area for nutrients, waste products, and other substances. It also enables the movement of materials around the cell, ensuring that essential compounds reach their destination.
Significance in Cellular Function
The cytoplasm is integral to a variety of cellular processes, such as:
- Metabolism: Many metabolic reactions occur in the cytoplasm, making it essential for energy production and overall cell metabolism.
- Cell Division: During cell division, the cytoplasm plays a key role in cytokinesis, where the cytoplasm divides to form two daughter cells.
- Support for Organelles: It provides a supportive environment for organelles, allowing them to function optimally without interference from the external environment.
In conclusion, option 'C' accurately describes cytoplasm as the jelly-like substance located between the nucleus and the cell membrane, essential for maintaining cellular integrity and supporting various functions.
Cytoplasm is a vital component of a cell, playing a crucial role in cellular functions. It is the jelly-like substance that fills the space between the cell membrane and the nucleus, and it houses various organelles necessary for the cell's operations.
Key Features of Cytoplasm
- Jelly-like Consistency: Cytoplasm has a semi-fluid consistency, which allows it to provide a medium for biochemical reactions to occur. This gel-like nature helps maintain the structure of organelles within the cell.
- Location: It is found between the cell membrane and the nucleus, acting as a buffer zone that supports and protects the organelles while facilitating communication between them.
- Storage and Transport: Cytoplasm serves as a storage area for nutrients, waste products, and other substances. It also enables the movement of materials around the cell, ensuring that essential compounds reach their destination.
Significance in Cellular Function
The cytoplasm is integral to a variety of cellular processes, such as:
- Metabolism: Many metabolic reactions occur in the cytoplasm, making it essential for energy production and overall cell metabolism.
- Cell Division: During cell division, the cytoplasm plays a key role in cytokinesis, where the cytoplasm divides to form two daughter cells.
- Support for Organelles: It provides a supportive environment for organelles, allowing them to function optimally without interference from the external environment.
In conclusion, option 'C' accurately describes cytoplasm as the jelly-like substance located between the nucleus and the cell membrane, essential for maintaining cellular integrity and supporting various functions.
The bird that was common sight in Delhi but now a special day is observed to raise awareness about the bird as it has became rare due to the urbanization. The bird is?- a)Peacock
- b)Koel
- c)Parrot
- d)Sparrow
Correct answer is option 'D'. Can you explain this answer?
a)
Peacock
b)
Koel
c)
Parrot
d)
Sparrow
|
Diksha Sharma answered |
Concept:
- Delhi's former Chief Minister Sheila Dixit raised her concern about the decreasing number of Humble house sparrows in Delhi.
- Due to urbanization on a large scale, the birds lost their natural habitat and fails to build nests. Causing them to disappear.
- Mobile radiation and Telecom towers are enemies of Sparrows.
- They navigate by sensing the earth's magnetic field but the Tv towers and telephone towers disturb the earth's magnetic field and thus they are unable to locate their home.
- Thus, the Chief Minister of Delhi declared the Humble home sparrow as the state bird of Delhi to raise awareness about it.
Explanation:
The bird was a common sight in Delhi but now a special day is observed to raise awareness about the bird as it has become rare due to the urbanization. The bird is a sparrow.
Additional Information
Which of the following plant pairs have bisexual flowers?- a)Hibiscus and Mustard
- b)Mustard and Watermelon
- c)Hibiscus and Watermelon
- d)Mustard and Papaya
Correct answer is option 'A'. Can you explain this answer?
a)
Hibiscus and Mustard
b)
Mustard and Watermelon
c)
Hibiscus and Watermelon
d)
Mustard and Papaya
|
Qudrat Chauhan answered |
The correct answer is Hibiscus and Mustard.
Key Points
- Hibiscus has both male and female reproductive parts in the same flower.
- The male reproductive parts are the stamens, which produce pollen.
- The female reproductive parts are the pistil, which contains the ovary and stigma.
Additional Information
- Mustard also has both male and female reproductive parts in the same flower. The male reproductive parts are the stamens, which produce pollen. The female reproductive parts are the pistil, which contains the ovary and stigma.
- Watermelonhas male flowers and female flowersand Papaya, on the other hand, has unisexual flowers. This means that male and female reproductive parts are in separate flowers.
- Papaya has separate male and female flowers on the same plant, so the individual flowers are not bisexual.
Which of the following diseases is known as cattle plague?- a)FMD
- b)Anthrax
- c)Rinderpest
- d)Cowpox
Correct answer is option 'C'. Can you explain this answer?
Which of the following diseases is known as cattle plague?
a)
FMD
b)
Anthrax
c)
Rinderpest
d)
Cowpox
|
|
Code Nation answered |
The correct answer is Rinderpest.
Key Points
- Rinderpest, also known as cattle plague, is a contagious viral disease affecting cloven-hoofed animals mainly cattle and buffalo.
- Rinderpest is caused by a virus of the familyParamyxoviridae, genusMorbillivirus.
Clinical signs:
- Fever, erosive lesions in the mouth, discharge from the nose and eyes.
- Profuse diarrhoea, and dehydration, often lead to death within 10 to 15 days.
Control measures:
- Movement control.
- Destruction of infected and contact animals.
- Disposal of carcasses and infective material.
- Sanitation and disinfection.
Assertion (A): Decomposers break down dead organic material, enriching the soil.
Reason (R): Vultures are considered decomposers as they consume dead animals.- a)Both (A) and (R) are true, and (R) is the correct explanation of (A).
- b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- c)(A) is true, but (R) is false.
- d)(A) is false, but (R) is true.
Correct answer is option 'B'. Can you explain this answer?
Reason (R): Vultures are considered decomposers as they consume dead animals.
a)
Both (A) and (R) are true, and (R) is the correct explanation of (A).
b)
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
c)
(A) is true, but (R) is false.
d)
(A) is false, but (R) is true.
|
Aditya Nair answered |
Assertion (A): Decomposers and Their Role
Decomposers are essential organisms in ecosystems that play a critical role in nutrient cycling. They break down dead organic material, such as fallen leaves, dead animals, and other organic waste.
- Enrichment of Soil:
- Through decomposition, nutrients like nitrogen, phosphorus, and potassium are released back into the soil.
- This process enhances soil fertility, allowing plants to grow better.
Reason (R): Vultures as Decomposers
Vultures are scavengers that feed on dead animals, but they are not classified as traditional decomposers.
- Feeding Behavior:
- Vultures consume carrion (dead animals), helping to clean the environment.
- However, they do not break down organic material at a microscopic level.
- Role of True Decomposers:
- True decomposers, such as fungi and bacteria, perform the chemical breakdown of organic matter.
- They facilitate the recycling of nutrients in the ecosystem.
Conclusion: Understanding the Relationship
- Both (A) and (R) are true statements.
- However, (R) does not correctly explain (A) because vultures do not enrich the soil directly; they merely consume dead animals.
Thus, the correct answer is option 'B': Both (A) and (R) are true, but (R) is not the correct explanation of (A).
Decomposers are essential organisms in ecosystems that play a critical role in nutrient cycling. They break down dead organic material, such as fallen leaves, dead animals, and other organic waste.
- Enrichment of Soil:
- Through decomposition, nutrients like nitrogen, phosphorus, and potassium are released back into the soil.
- This process enhances soil fertility, allowing plants to grow better.
Reason (R): Vultures as Decomposers
Vultures are scavengers that feed on dead animals, but they are not classified as traditional decomposers.
- Feeding Behavior:
- Vultures consume carrion (dead animals), helping to clean the environment.
- However, they do not break down organic material at a microscopic level.
- Role of True Decomposers:
- True decomposers, such as fungi and bacteria, perform the chemical breakdown of organic matter.
- They facilitate the recycling of nutrients in the ecosystem.
Conclusion: Understanding the Relationship
- Both (A) and (R) are true statements.
- However, (R) does not correctly explain (A) because vultures do not enrich the soil directly; they merely consume dead animals.
Thus, the correct answer is option 'B': Both (A) and (R) are true, but (R) is not the correct explanation of (A).
The village got its name from the many khejri trees growing there. The people of this village take great care of the plants, trees, and animals. In India this village is
- a)in Uttaranchal
- b)in Uttar Pradesh
- c)in Maharashtra
- d)in Rajasthan
Correct answer is option 'D'. Can you explain this answer?
The village got its name from the many khejri trees growing there. The people of this village take great care of the plants, trees, and animals. In India this village is
a)
in Uttaranchal
b)
in Uttar Pradesh
c)
in Maharashtra
d)
in Rajasthan
|
Tech Era answered |
Khejadli or Khejarli is a village in the
Jodhpur district of Rajasthan.
The name of the town is derived from Khejadi
trees that were once abundant in the village.
Key Points
About Khejadi tree:
- Its scientific name is Prosopis cineraria.
- It is known by different names across India, e.g. Shami in Maharastra & Uttar Pradesh, Jammi in Telangana, Khijro in Gujarat, Khejri in Rajasthan, Janti in Haryana, and Jand in Punjab.
- It is a species of flowering tree in the pea family, Fabaceae.
- The Khejadi tree is found mainly in desert areas.
- It can grow without much water.
- Its bark is used for making medicines.
- People cook and eat its fruits.
- Its wood is such that it is not affected by insects.
- Animals in the area eat the leaves of the Khejadi.
Therefore, t
he correct answer is Rajasthan.
Additional Information
About the Khejadli village:
- In the Khejadli village, no tree is cut and no animal is harmed.
- The people of Khejadli village take the responsibility of protecting the Khejadi treesupon themselves as a part of their culture.
- The people of Khejadli village are well known for their revolt against the king,who has ordered the felling down of these Khejadi trees for wood.
- The people hugged the trees and did not let them go and died saving them.
- Even today, the people of this area, called Bishnois, continue to protect plants and animals.
- Even though in the middle of the desert, this area is green and animals roam freely without fear.
Which of the following is NOT classified as macronutrient in plant nutrition?- a)Nitrogen
- b)Phosphorous
- c)Potassium
- d)Iron
Correct answer is option 'D'. Can you explain this answer?
a)
Nitrogen
b)
Phosphorous
c)
Potassium
d)
Iron
|
Aditi Dasgupta answered |
Understanding Macronutrients in Plant Nutrition
In plant nutrition, macronutrients are essential elements required in larger quantities for plant growth and development. The three primary macronutrients are:
Micronutrients vs. Macronutrients
In contrast, micronutrients are essential elements needed in smaller amounts. Iron (Fe) is classified as a micronutrient because:
Conclusion
Therefore, among the options provided, Iron is not classified as a macronutrient. Instead, it is a crucial micronutrient that is essential for plant health but needed in much smaller amounts compared to nitrogen, phosphorus, and potassium. Understanding the distinction between macronutrients and micronutrients is critical for effective plant nutrition management.
In plant nutrition, macronutrients are essential elements required in larger quantities for plant growth and development. The three primary macronutrients are:
- Nitrogen (N): Crucial for the synthesis of amino acids, proteins, and chlorophyll.
- Phosphorus (P): Vital for energy transfer, photosynthesis, and the formation of nucleic acids.
- Potassium (K): Important for regulating various physiological processes, including water uptake and enzyme activation.
Micronutrients vs. Macronutrients
In contrast, micronutrients are essential elements needed in smaller amounts. Iron (Fe) is classified as a micronutrient because:
- Essential for Chlorophyll Production: Iron plays a critical role in the formation of chlorophyll, which is vital for photosynthesis.
- Involved in Enzymatic Reactions: It acts as a cofactor for various enzymes involved in plant metabolism.
- Required in Trace Amounts: Unlike macronutrients, plants only require iron in minute quantities for optimal growth.
Conclusion
Therefore, among the options provided, Iron is not classified as a macronutrient. Instead, it is a crucial micronutrient that is essential for plant health but needed in much smaller amounts compared to nitrogen, phosphorus, and potassium. Understanding the distinction between macronutrients and micronutrients is critical for effective plant nutrition management.
Choose the correct statement about weeds. (A) Weeds grow in the fields without being planted. (B) It is important to remove weeds from the field. (C) Weeds reduce the production of field by using the water and fertilizers given to the crops. (D) Weeds do not affect the production of crops.- a)(A) and (B)
- b)(A) and (C)
- c)(A), (B) and (C)
- d)(A), (B) and (D)
Correct answer is option 'C'. Can you explain this answer?
Choose the correct statement about weeds.
(A) Weeds grow in the fields without being planted.
(B) It is important to remove weeds from the field.
(C) Weeds reduce the production of field by using the water and fertilizers given to the crops.
(D) Weeds do not affect the production of crops.
a)
(A) and (B)
b)
(A) and (C)
c)
(A), (B) and (C)
d)
(A), (B) and (D)
|
|
Raghavendra Gupta answered |
Weeds in Fields
Removing weeds from the field is crucial for maximizing crop production. Weeds compete with crops for essential resources like water and nutrients, which can hinder the growth and development of the desired plants. Therefore, it is important to control and manage weeds effectively to ensure optimal crop yields.
Effects of Weeds
Weeds reduce the production of fields by utilizing water and fertilizers that are meant for the crops. This competition for resources can lead to stunted growth, lower yields, and overall reduced productivity of the field. By removing weeds, farmers can ensure that their crops receive the necessary resources for healthy growth and maximum output.
Conclusion
In conclusion, weeds are unwanted plants that grow in fields without being planted. They have a negative impact on crop production by competing for essential resources. Therefore, it is essential to remove weeds from fields to prevent them from affecting the growth and yield of crops.
Removing weeds from the field is crucial for maximizing crop production. Weeds compete with crops for essential resources like water and nutrients, which can hinder the growth and development of the desired plants. Therefore, it is important to control and manage weeds effectively to ensure optimal crop yields.
Effects of Weeds
Weeds reduce the production of fields by utilizing water and fertilizers that are meant for the crops. This competition for resources can lead to stunted growth, lower yields, and overall reduced productivity of the field. By removing weeds, farmers can ensure that their crops receive the necessary resources for healthy growth and maximum output.
Conclusion
In conclusion, weeds are unwanted plants that grow in fields without being planted. They have a negative impact on crop production by competing for essential resources. Therefore, it is essential to remove weeds from fields to prevent them from affecting the growth and yield of crops.
________ is / are found in the plant cell wall.- a)Cellulose
- b)Hemicellulose
- c)Both stated above
- d)Nepanthus
Correct answer is option 'C'. Can you explain this answer?
________ is / are found in the plant cell wall.
a)
Cellulose
b)
Hemicellulose
c)
Both stated above
d)
Nepanthus
|
|
Gargi Bose answered |
Plant Cell Wall Components:
Cell walls in plant cells are composed of various components that provide structural support and protection to the cell. Two of the main components found in the plant cell wall are cellulose and hemicellulose.
Cellulose:
- Cellulose is a long chain polymer of glucose molecules.
- It is a major component of the plant cell wall, providing strength and rigidity.
- Cellulose fibers form a network that gives the cell wall its structural integrity.
- Cellulose is synthesized by enzyme complexes called cellulose synthases, which are embedded in the cell membrane.
Hemicellulose:
- Hemicellulose is a complex carbohydrate that consists of various sugar molecules.
- It plays a role in cross-linking cellulose fibers in the cell wall, contributing to its overall strength.
- Hemicellulose also helps in water retention and provides flexibility to the cell wall.
- Different types of hemicelluloses are found in plant cell walls, such as xylans, mannans, and glucans.
Conclusion:
Both cellulose and hemicellulose are essential components of the plant cell wall, working together to provide structural support, protection, and flexibility to plant cells. These components are crucial for the overall function and integrity of plant cells.
Cell walls in plant cells are composed of various components that provide structural support and protection to the cell. Two of the main components found in the plant cell wall are cellulose and hemicellulose.
Cellulose:
- Cellulose is a long chain polymer of glucose molecules.
- It is a major component of the plant cell wall, providing strength and rigidity.
- Cellulose fibers form a network that gives the cell wall its structural integrity.
- Cellulose is synthesized by enzyme complexes called cellulose synthases, which are embedded in the cell membrane.
Hemicellulose:
- Hemicellulose is a complex carbohydrate that consists of various sugar molecules.
- It plays a role in cross-linking cellulose fibers in the cell wall, contributing to its overall strength.
- Hemicellulose also helps in water retention and provides flexibility to the cell wall.
- Different types of hemicelluloses are found in plant cell walls, such as xylans, mannans, and glucans.
Conclusion:
Both cellulose and hemicellulose are essential components of the plant cell wall, working together to provide structural support, protection, and flexibility to plant cells. These components are crucial for the overall function and integrity of plant cells.
The feathers of the birds are of different colours, shapes and sizes. Their feathers help them to fly and A. eat different types of food B. keep them warm C. walk in different ways D. keep them waterproof - a)B and C
- b)B and D
- c)B, C and D
- d)A, B, C and D
Correct answer is option 'B'. Can you explain this answer?
The feathers of the birds are of different colours, shapes and sizes. Their feathers help them to fly and
A. eat different types of food
B. keep them warm
C. walk in different ways
D. keep them waterproof
a)
B and C
b)
B and D
c)
B, C and D
d)
A, B, C and D
|
Hridoy Yadav answered |
Feathers of Birds
Feathers of birds are not just for aesthetic purposes, they serve several important functions for the birds.
Help Them to Fly
One of the primary functions of bird feathers is to help them fly. The shape and structure of feathers are essential for providing lift and enabling birds to soar through the air.
Keep Them Warm
Bird feathers also serve as insulation, helping to regulate the bird's body temperature. The downy feathers close to the bird's body trap air and create a layer of warmth, keeping the bird comfortable in various weather conditions.
Keep Them Waterproof
Another important function of bird feathers is to keep the birds dry. Many birds have specialized oil glands that they use to preen their feathers, which helps to waterproof them and prevent water from seeping in.
Conclusion
In conclusion, bird feathers play a crucial role in the survival and well-being of birds. They not only enable birds to fly, but also keep them warm, dry, and comfortable in their environment.
Feathers of birds are not just for aesthetic purposes, they serve several important functions for the birds.
Help Them to Fly
One of the primary functions of bird feathers is to help them fly. The shape and structure of feathers are essential for providing lift and enabling birds to soar through the air.
Keep Them Warm
Bird feathers also serve as insulation, helping to regulate the bird's body temperature. The downy feathers close to the bird's body trap air and create a layer of warmth, keeping the bird comfortable in various weather conditions.
Keep Them Waterproof
Another important function of bird feathers is to keep the birds dry. Many birds have specialized oil glands that they use to preen their feathers, which helps to waterproof them and prevent water from seeping in.
Conclusion
In conclusion, bird feathers play a crucial role in the survival and well-being of birds. They not only enable birds to fly, but also keep them warm, dry, and comfortable in their environment.
I am a/an _____. I can find my female worm from many kilometers away by her smell.- a)earthworm
- b)flatworm
- c)tapeworm
- d)silkworm
Correct answer is option 'D'. Can you explain this answer?
a)
earthworm
b)
flatworm
c)
tapeworm
d)
silkworm
|
|
Sanjana Chavan answered |
Understanding the Correct Answer: Silkworm
Silkworms, specifically the larvae of the silk moth (Bombyx mori), possess a remarkable ability to locate potential mates over considerable distances using their sense of smell. This capability is primarily due to the following factors:
1. Pheromone Detection
- Silkworm females release specific chemical signals known as pheromones into the air.
- Males can detect these pheromones from several kilometers away using their highly sensitive antennae.
- This adaptation is crucial for reproduction, as it allows males to find females even in dense environments.
2. Sensory Adaptations
- The antennae of silkworm males are equipped with specialized sensory receptors.
- These receptors respond to the chemical composition of the pheromones, enabling precise detection.
- This biological design enhances their ability to locate a mate, ensuring the continuation of their species.
3. Importance in Reproduction
- The ability to find females from long distances increases mating opportunities.
- Successful mating is essential for the lifecycle of silkworms, as they are cultivated for silk production.
- Farmers and breeders often rely on this natural behavior to optimize breeding programs.
Conclusion
In conclusion, silkworms are uniquely adapted to find their female counterparts using chemical cues. This distinguishes them from earthworms, flatworms, and tapeworms, which do not possess the same level of olfactory capabilities for mate detection. Understanding these biological traits is essential in the context of their ecological and economic significance.
Silkworms, specifically the larvae of the silk moth (Bombyx mori), possess a remarkable ability to locate potential mates over considerable distances using their sense of smell. This capability is primarily due to the following factors:
1. Pheromone Detection
- Silkworm females release specific chemical signals known as pheromones into the air.
- Males can detect these pheromones from several kilometers away using their highly sensitive antennae.
- This adaptation is crucial for reproduction, as it allows males to find females even in dense environments.
2. Sensory Adaptations
- The antennae of silkworm males are equipped with specialized sensory receptors.
- These receptors respond to the chemical composition of the pheromones, enabling precise detection.
- This biological design enhances their ability to locate a mate, ensuring the continuation of their species.
3. Importance in Reproduction
- The ability to find females from long distances increases mating opportunities.
- Successful mating is essential for the lifecycle of silkworms, as they are cultivated for silk production.
- Farmers and breeders often rely on this natural behavior to optimize breeding programs.
Conclusion
In conclusion, silkworms are uniquely adapted to find their female counterparts using chemical cues. This distinguishes them from earthworms, flatworms, and tapeworms, which do not possess the same level of olfactory capabilities for mate detection. Understanding these biological traits is essential in the context of their ecological and economic significance.
A boy wakes up a night and sees a bird flying very fast through the corners of buildings. When he studied that bird, he knows that these birds can see good at night and only in the colour black and white. These birds are known as _____- a)Binocular bird
- b)Flightless bird
- c)Nocturnal birds
- d)Diurnal bird
Correct answer is option 'C'. Can you explain this answer?
a)
Binocular bird
b)
Flightless bird
c)
Nocturnal birds
d)
Diurnal bird
|
Vaibhav Menon answered |
Explanation:
- Nocturnal birds: Nocturnal birds are birds that are active during the night. They have specially adapted eyes that allow them to see well in low light conditions. This enables them to hunt for food and navigate in the dark.
- Black and white vision: Nocturnal birds typically have monochromatic vision, which means they see in black and white. This type of vision helps them to detect movement and contrast in low light situations.
- Fast flying: Nocturnal birds, such as owls and nightjars, are known for their fast and agile flight. This allows them to quickly catch their prey in the darkness.
- Adapted for night: These birds have evolved to have keen hearing and silent flight to aid in their nocturnal activities. Their feathers are designed to dampen sound, making them stealthy hunters.
In conclusion, the boy likely observed a nocturnal bird with black and white vision flying swiftly through the night, showcasing its unique adaptations for hunting and survival in low light conditions.
Cell wall is absent in which one of the following organisms?- a)Bacteria
- b)Diatom
- c)Mushroom
- d)Tapeworm
Correct answer is option 'D'. Can you explain this answer?
a)
Bacteria
b)
Diatom
c)
Mushroom
d)
Tapeworm
|
Ritesh Kumar Shivhare answered |
The correct answer is
Tapeworms
.Key Points
- Tapeworms are parasitic flatworms that belong to the phylum Platyhelminthes.
- Unlike plant cells and some other organisms, tapeworms do not have a rigid cell wall.
- Instead, they have a flexible outer covering called a tegument, an adaptation to their parasitic lifestyle.
- The tegument helps tapeworms absorb nutrients from the intestinal lining of their host.
Additional Information
- Bacteria generally have a cell wall.
- The bacterial cell wall is a protective outer layer that maintains the shape of the cell and provides structural support.
- It is composed of peptidoglycan in most bacteria, but there is variation in the composition of the cell wall between different bacterial groups.
- Diatoms are unicellular or multicellular algae, and they have a unique cell wall made of silica.
- The cell wall, known as a frustule, provides protection and rigidity to the diatom cell.
- Fungi, including mushrooms, have a cell wall.
- Fungal cell walls are composed primarily of chitin, a complex sugar.
- The cell wall of fungi functions to maintain the shape of the cell and protect the fungal cell.
Which of the following was brought to our country by the traders coming from South America?- a)Cabbage
- b)Tomato
- c)Pea
- d)Bhindi
Correct answer is option 'B'. Can you explain this answer?
Which of the following was brought to our country by the traders coming from South America?
a)
Cabbage
b)
Tomato
c)
Pea
d)
Bhindi
|
KnowIT answered |
Concept:
- Humans carry seeds from one place to another, knowingly or unknowingly.
- People bring the seeds of plants that they find beautiful or useful, to grow in the garden.
- Later the seeds of these plants spread to other places.
- Many years later people may not even remember that these plants did not grow there earlier.
Explanation:
Vegetables and their country of origin:
Thus, tomatoes are originally from South America.
Identify the incorrect statement - a)Bacteria, fungi, protozoa and some algae are major groups of microorganisms.
- b)All Fungi reproduce inside the cells of the host organism
- c)Microorganism may not be unicellular.
- d)Some microorganisms are useful while some are harmful for human beings.
Correct answer is option 'B'. Can you explain this answer?
a)
Bacteria, fungi, protozoa and some algae are major groups of microorganisms.
b)
All Fungi reproduce inside the cells of the host organism
c)
Microorganism may not be unicellular.
d)
Some microorganisms are useful while some are harmful for human beings.
|
Pk Academy answered |
Explanation:
- Microorganisms are living organisms that cannot be seen by the human eye.
- Bacteria, fungi, protozoa, and some algae are major groups of microorganisms.
- Viruses are also microscopic but they are behaving as living being only inside a host body.
- Some microorganisms are useful while some are harmful to human beings. Microorganisms are used for various purposes like fermentation, nitrogen fixation and preparation of certain antibiotics.
- Microorganisms can be both unicellular and multicellular.
- Bacteria and some algae are unicellular, while some of algae, fungi etc are multicellular.
- Fungi reproduce inside the cells of the host organism. This is wrong as the statement suits for the virus.
So the correct option is 'Fungi reproduce inside the cells of the host organism.'
Which part of the banana plant is not used as food?- a)Fruit
- b)Trunk
- c)Flower
- d)Root
Correct answer is option 'D'. Can you explain this answer?
a)
Fruit
b)
Trunk
c)
Flower
d)
Root
|
|
Pk Academy answered |
Concept
:
Edible plants:
- An edible item is any item that is safe for humans to eat.
- Nonpoisonous items found in nature – such as mushrooms, insects, seaweed, and so forth – are referred to as edible.
- Below are examples of seeds, roots, leaves, flowers, fruit, and stem.
Non Edible plants:
- The plant parts which humans cannot eat are called non-edible.
- Non Edible plants use for shampoo, make-up, laundry detergent, and decoration purposes.
Explanation :
Banana :
- A banana is an elongated, edible fruit.
- The roots of the banana plants are the only parts that are not consumed as food by humans.
- The banana plant has numerous edible parts, such as the inner stem, flower, and fruit.
- The banana flower and the stem are eaten in most parts of northeast India as a vegetable.
- The leaf is used to serve food.
- The only non-edible part of the banana plant is its root.
Thus, the part of a banana plant not used as food is the root.
The name of the scientist who did experiments with the pea plant and on the basis of observation concluded that the pea plants have some traits which come in pairs; such as tall or short, yellow or green, rough or smooth, etc. is:
- a)George Mestral
- b)Charles Darwin
- c)Gregor Mendel
- d)M. S. Swaminathan
Correct answer is option 'C'. Can you explain this answer?
The name of the scientist who did experiments with the pea plant and on the basis of observation concluded that the pea plants have some traits which come in pairs; such as tall or short, yellow or green, rough or smooth, etc. is:
a)
George Mestral
b)
Charles Darwin
c)
Gregor Mendel
d)
M. S. Swaminathan
|
|
Diksha Sharma answered |
About Gregor Mendel:
- Gregor Mendel, a 19th-century Augustinian monk.
- He was born in a poor farmer’s family in Austria in 1822.
- He is called the father of modern genetics.
- He found that the pea plant has some traits which come in pairs (called an allele).
- Mendel's pea plant experiments conducted between 1856 and 1863 established many of the fundamental laws of heredity.
- It is now referred to as the laws of Mendelian inheritance.
Gregor Johann Mendels Theory:
- Mendel used a number of contrasting visible characters of garden peas- round/wrinkled seeds, tall/short plants, white/violet flowers, and so on.
- He took pea plants with different characteristics- a tall plant and a short plant, produced progeny from them and calculated the percentages of tall or short progeny.
Thus, the correct answer is Gregor Mendal.
Additional Information
Darwin Theory:
- Darwin gave the theory of natural selection.
- Each species reproduces to maintain its race.
- The species struggle for survival with changing environmental conditions.
- The species adapts with the surroundings survives and rest extinctions.
MS Swaminathan:
- He was a geneticist.
- He is remembered as he had introduced a high-yielding variety of wheat.
- Book "The Quest for a World Without Hunger" was released by Prime Minister Narendra Modi on MS Swaminathan.
George Mestral:
- In 1948, one day George Mestral came back from a walk with his dog.
- He was amazed to find seeds sticking all over his clothes and on his dog’s fur.
- He wondered what made them stick.
- So he observed these seeds under a microscope.
- He saw that the seeds had many tiny hooks which got stuck to clothes or fur.
- This gave Mestral the idea of making Velcro.
- He made a material with similar tiny hooks that would stick.
- Velcro is used to stick together many things – clothes, shoes, bags, belts and many more.
Which protein is naturally found in some grains including wheat, barley and rye?- a)Renin
- b)Pepsin
- c)Gluten
- d)Maltase
Correct answer is option 'C'. Can you explain this answer?
a)
Renin
b)
Pepsin
c)
Gluten
d)
Maltase
|
Anil Kumar answered |
The correct answer is Gluten.
Key Points
- Gluten
- The protein which is naturally found in some grains including wheat, barley and rye is Gluten.
- Although the term "gluten" is frequently solely used to describe proteins found in wheat, it is actually used in medical literature to describe a combination of prolamin and glutelin proteins that are found naturally in all grains and have been shown to be capable of causing celiac disease.
- Triticeae glutens in particular have outstanding viscoelastic and adhesive properties that give the dough its elasticity, help it rise and hold its shape, and frequently produce a chewy texture in the final product.
- The protein which is
Additional Information
- Proteins
- Large, intricate molecules known as proteins play a variety of vital functions in the body.
- They are crucial for the structure, operation, and control of the body's tissues and organs and carry out the majority of their job inside cells.
- Plant-based foods (fruits, vegetables, grains, nuts, and seeds) frequently lack one or more essential amino acids, but animal-based foods (meat, chicken, fish, eggs, and dairy products) are frequently good sources of complete protein.
Choose the correct statement: A. Honeybees are attracted to the litchi flowers. B. Honeybees lay their eggs from January to March. C. October to December is the best time to start beekeeping.- a)A and B
- b)B and C
- c)A and C
- d)A, B and C
Correct answer is option 'C'. Can you explain this answer?
Choose the correct statement:
A. Honeybees are attracted to the litchi flowers.
B. Honeybees lay their eggs from January to March.
C. October to December is the best time to start beekeeping.
a)
A and B
b)
B and C
c)
A and C
d)
A, B and C
|
CodeNation answered |
Concept:
- The honeybee is an insect belonging to the genus Apis.
- Honeybees are excellent pollinators.
- They collect nectars from flowers and help in transferring their pollen.
- Honeybees are commercially exploited to extract honey from their hives.
Explanation:
- Because of the many benefits of honey, beekeeping becomes very profitable commercially.
- Many state governments run programs to train young students in beekeeping.
- In the training, the following things can be learned:
- Types of flowers that attract honeybees: Honeybees are attracted to litchi flowers.
- The egg-laying pattern of honeybees: Honeybees lay their eggs from October to December.
- The best time to start beekeeping is October to December.
Thus;
A. Honeybees are attracted to the litchi flowers. Correct
B. Honeybees lay their eggs from January to March. Incorrect
C. October to December is the best time to start beekeeping. Correct
Additional Information
- Honeybees live in colonies with one queen running the whole hive.
- Worker honeybees are all females.
- Worker bees are the only bees most people ever see flying around outside of the hive.
- They forage for food, build honeycombs, and protect the hive.
- Male bees are called drones.
The cell organelles of eukaryotic cells are moved by- a)Actin filaments only
- b)Microtubules only
- c)Both actin filaments and microtubules
- d)Both cilia and flagella
Correct answer is option 'C'. Can you explain this answer?
a)
Actin filaments only
b)
Microtubules only
c)
Both actin filaments and microtubules
d)
Both cilia and flagella
|
Hackers World answered |
Key Points
- The membrane-bound organelles are a characteristic feature of eukaryotic cells.
- These organelles are moved as a result of cytoplasmic streaming which is driven by cytoskeletal elements.
- The cytoskeleton consists of a network of protein filaments present throughout the cytoplasm.
- They play important role in forming structural framework of the cell.
- They also help in cell movement and internal movement of cellular structures.
- They have the ability to get reorganized as the cell changes shape or moves.
Important Points
- The cytoskeleton comprises of 3 major protein filaments - actin filaments, intermediate filaments and microtubules.
- Actin filaments:
- They constitute the microfilaments and can be present in globular (G-actin) or filamentous (F-actin) forms.
- They function in the presence of ATP to form the polar filamentous structures.
- They provide the track for vesicle and organelle movement inside the cell.
- They take part in cytokinesis during cell division and muscle contraction in animals.
- Microtubules:
- These are formed by α-tubulin and β-tubulin proteins.
- These proteins form 13 polymerized dimers called protofilaments.
- These protofilaments are arranged in a ring-like structure to form the hollow structure of microtubules.
- They are the structural elements of cilia, flagella and centrioles.
- They help in chromosome movement to opposite poles during cell division.
- They provide the track along which vesicles and cellular organelles move through the cell.
- Intermediate filaments:
- They are made of several strands of fibrous proteins that remain bound together.
- They are of intermediate size between actin filaments and microtubules.
- They have no role in cell movement.
- They maintain the shape of the cell and hold the organelles in place.
- It is made of proteins like Keratin that strengthens hair and nails.
- Actin and microtubules form a network of proteins that create a rail-like track for organelle movement.
- The organelles are bound to the cytoskeletal proteins which move along the tracks.
- This movement is ATP-dependent and takes place gradually in a step-wise manner.
Which of the following statements is/are true regarding fungi A. They are plants B. They cannot perform photosynthesis C. All fungi are unicellular D. some fungi help in producing antibiotics- a)A, B, C
- b)A, B, D
- c)B, C, D
- d)A, C, D
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is/are true regarding fungi
A. They are plants
B. They cannot perform photosynthesis
C. All fungi are unicellular
D. some fungi help in producing antibiotics
a)
A, B, C
b)
A, B, D
c)
B, C, D
d)
A, C, D
|
|
Pk Academy answered |
The correct answer is A, B, D.
Concept:
- Fungi are eukaryotic organisms that include yeasts, moulds, and mushrooms.
- These organisms belong to the kingdom Fungi.
- The organisms found in the Kingdom Fungi have a cell wal.
- Among living organisms, they are classified as heterotrophs.
Explanation:
A. They are plants (TRUE)
A. They are plants (TRUE)
- Fungi are plants that do not have chlorophyll.
- Fungi have a cell wall made which is made of chitin and obtain nutrients through absorption.
- They are unable to photosynthesis because they lack chlorophyll.
- Fungi are either decomposers or parasites. Decomposers obtain their nutrients from decomposing biological matter
B. They cannot perform photosynthesis (TRUE)
- Fungi do not perform photosynthesis because fungi do not contain the green pigment chlorophyll.
- Fungi obtain their food by absorbing dissolved molecules and secreting digestive enzymes into their surroundings.
C. All fungi are unicellular (FALSE)
- Fungi are both unicellular and multicellular.
- With the exception of yeast, most fungi are multicellular. Yeast are unicellular.
D. some fungi help in producing antibiotics (TRUE)
- Antibiotics can be obtained naturally from bacteria or fungi (moulds are a type of fungi) or synthesized in laboratories.
- Alexander Fleming discovered penicillin in 1928, derived from the fungus Penicillium Notatum (a type of fungi).
An ant was going along on the ground. It saw a group of ants coming from the other side. The first ant recognized that the group was not his and he came back to its hole. How did the ant know that the other ants were not from its group?- a)By their appearance
- b)Through their voice
- c)Through their walking pattern
- d)Through the sense of smell
Correct answer is option 'D'. Can you explain this answer?
An ant was going along on the ground. It saw a group of ants coming from the other side. The first ant recognized that the group was not his and he came back to its hole.
How did the ant know that the other ants were not from its group?
a)
By their appearance
b)
Through their voice
c)
Through their walking pattern
d)
Through the sense of smell
|
Krishan Kumar answered |
Concept:
- Insects have different senses.
- They can see, hear, taste, smell and feel.
- Some animals can see their prey from far away.
- Some can hear even the faintest sound.
- Some insects can find their friends by their smell.
Explanation:
- As the ants move, they leave a smell on the ground.
- The other ants follow the smell to find the way.
- The smell is recognised and identified by the members of the same group only.
- An ant thus uses its smell as an identity proof.
Thus, the ant knows that the other ants were not from its group through their smell.
We can see only up to a distance of 2 meters, but how many meters away can vultures, eagles, and kites see?- a)8 meters
- b)5 meters
- c)7 meters
- d)9 meters
Correct answer is option 'A'. Can you explain this answer?
a)
8 meters
b)
5 meters
c)
7 meters
d)
9 meters
|
|
Code Nation answered |
Concept:
- Different birds have different types of vision.
- The type of vision they have depends on their source of food.
Explanation:
Monocular vision:
- Birds with eyes on the sides of their headshave a wide visual field.
- It is useful for detecting prey.
- Such birds can focus on two different things at a time.
- When they look straight ahead, both their eyes focus on the same object.
- They don't have to move their heads to see around.
- They can see four times as far as we can.
- Example: Kites, Eagles, Vultures.
Binocular vision:
- While those with eyes on the front of their heads have binocular vision.
- Such birds can estimate distances when hunting.
- They have to move their heads to see around.
- The binocular vision of birds makes themsee distinctly.
- Example: Owl, Crows, Doves, Peacock, Nightingales, Parrots, Pigeons etc.
Thus, Kites, Eagles and Vultures can see up to 8 meters away.
There are some plants which hunt/trap mices, frogs, insects and small animals. Nepenthese is most famous amongst them. This plant is found mainly in which part of the country?- a)Kerala
- b)Andhra Pradesh
- c)Himachal Pradesh
- d)Meghalaya
Correct answer is option 'D'. Can you explain this answer?
There are some plants which hunt/trap mices, frogs, insects and small animals. Nepenthese is most famous amongst them. This plant is found mainly in which part of the country?
a)
Kerala
b)
Andhra Pradesh
c)
Himachal Pradesh
d)
Meghalaya
|
|
Anil Kumar answered |
Key Points
Concept:
- Carnivorous plants obtain essential nutrients from the heterotrophs.
- These plants trap insects and obtain the nutrients they do not get from the soil.
- They are not called heterotrophs or consumers because they only derive nutrients from insects.
- These plants get energy from the process of photosynthesis.
- Hence they are both producers and carnivores.
Explanation:
Nepenthes is a plant that:
- It can trap and eat frogs, insects and even mice.
- It is found in Australia, Indonesia and Meghalaya in India.
- It has a pitcher-like shape, and a leaf covers the mouth.
- It has a special smell that attracts insects, which get trapped and can't get out.
Thus, the correct answer is Meghalaya.
Match the following:
- a)(A - IV), (B - III), (C - II), (D - I)
- b)(A - III), (B - IV), (C - I), (D - II)
- c)(A - II), (B - I), (C - IV), (D - III)
- d)(A - II), (B - III), (C - IV), (D - I)
Correct answer is option 'B'. Can you explain this answer?
Match the following:
a)
(A - IV), (B - III), (C - II), (D - I)
b)
(A - III), (B - IV), (C - I), (D - II)
c)
(A - II), (B - I), (C - IV), (D - III)
d)
(A - II), (B - III), (C - IV), (D - I)
|
|
Qudrat Chauhan answered |
The correct answer is (A - III), (B - IV), (C - I), (D - II).
Key Points
- Vascular tissue or complex tissue is characteristic of plants.
- Transport in plants occurs by the xylem and phloem.
- The xylem conducts water, and the phloem conducts food.
Transpiration:
- It is the loss of water from the stomata.
- The exchange of gases takes during transpiration.
- It builds up the transpiration pull, and water is absorbed from the roots.
Osmosis:
- Diffusion of water across a semi-permeable membrane.
- It occurs from high concentration to low concentration along the gradient.
- It is downhill transport and does not require any energy.
Translocation:
- Bulk flow of substances.
- It is also known as mass flow.
- It occurs with the vascular tissue, such as the xylem and phloem.
Ascent of sap:
- It is the transport of water from root to shoot.
- It is the flow of water against gravity.
- Here upward flow of water takes place.
Additional Information
Below is the pictorial representation of osmosis
Select from the following, the reasons of considering the earthworms as the friends of the farmers: A) Earthworms soften the soil of the field in which they live by digging the soil underneath. B) The tunnels dug by earthworms provide easy passage for air and water into the soil. C) The earthworms eat the weeds and save the main crop. D) The earthworms eat the dead leaves and plants. The dropping of the earthworms makes the soil more fertile. The correct statements are- a)A, B and C
- b)A, B and D
- c)C, D and A
- d)B, C and D
Correct answer is option 'B'. Can you explain this answer?
Select from the following, the reasons of considering the earthworms as the friends of the farmers:
A) Earthworms soften the soil of the field in which they live by digging the soil underneath.
B) The tunnels dug by earthworms provide easy passage for air and water into the soil.
C) The earthworms eat the weeds and save the main crop.
D) The earthworms eat the dead leaves and plants. The dropping of the earthworms makes the soil more fertile.
The correct statements are
a)
A, B and C
b)
A, B and D
c)
C, D and A
d)
B, C and D
|
|
Krishan Kumar answered |
Explanation:
Earthworm:
- The earthwormis a reddish-brown terrestrialinvertebrate.
- They inhabitthe upper layer of themoist soil.
- During day time, they live in burrows made by boringandswallowingthesoil.
- Earthworms play a vital role in the natural cycle of the earth.
- The Earthworms soften the soil by digging underneath to make tunnels.
- They play a crucial role in breaking down organic matter and fertilising the soil,simply through their constant eating and pooping.
- Earthworms can be used for fishing and compost.
- Worms are important to the ecosystems in which they live and breed.
- They are known as farmers friends as their compost helps in enriching the soil and give bountiful produce.
- Kingdom: Animalia
- Phylum: Annelida
- Class: Clitellata
- Family: Lumbricidia
Important Points
Earthworms are useful in several ways for farmers:
- Earthworms make the soil porousby digging burrows in the soil. Hence they are calledfriends of the farmers.
- The nitrogenous wastes and other waste products of the earthworms form food for plants. This process of increasing the fertility of the soil by earthworms is called vermicomposting.
- Earthworms are used as fish bait to catch fish.
- Some tribals in India use earthworms as medicine to cure jaundice, piles, diarrhoea, bladder stones, etc.
- The earthworms reduce both acidity and alkalinity of the soilandcreate optimum conditions for plant growth.
- The density of earthworms in the soil is considered to be a good indicator of healthy soil because they increase the soil's water-holding capacity and moisture content.
Thus,
A) Earthworms soften the soil of the field in which they live by digging the soil underneath. - Correct
B) The tunnels dug by earthworms provide easy passage for air and water into the soil. - Correct
C) The earthworms eat the weeds and save the main crop. - Incorrect
D) The earthworms eat the dead leaves and plants. The dropping of the earthworms make the soil more fertile - Correct.
How does a eukaryotic cell wall differ from that of a prokaryote? It is due to the presence of- a)cellulose
- b)diaminopimelic acid
- c)muramic acid
- d)peptidoglycan
Correct answer is option 'A'. Can you explain this answer?
a)
cellulose
b)
diaminopimelic acid
c)
muramic acid
d)
peptidoglycan
|
|
Hackers World answered |
The correct answer is cellulose.
Key Points
- The eukaryotic cell wall differs from that of a prokaryote in having the cell wall made up of cellulose.
Concept:
- Cell Wall - It is a non-living rigid structure that forms an outer covering for the plasma membrane of fungi & plants.
- The cell wall not only gives shape to the cell and protects the cell from mechanical damage and infection, but it also helps in cell-to-cell interaction and provides a barrier to undesirable macromolecules.
Explanation:
The cell wall of eukaryotic & prokaryotic cells differs in the constituent composition.
- Eukaryotic cell wall - Algae have a cell wall, made of cellulose, Galatians, mannans, and minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose, pectins, and proteins.
- Prokaryotic cell wall -
- The cell of prokaryotes like bacteria is made up of peptidoglycans
- The peptidoglycan consists of two chains - the Long-chain (Glycon chain) and the short-chain (tetrapeptide chain).
- The long chain is made up of N-acetyl glucosamine & N-acetyl muramic acid while the short chain consists of 4 amino acids namely L-alanine, L-lysine, D-glutamic acid & D-alanine.
The prokaryotic cell wall does not have cellulose, hence it will be the correct answer.
Cattle disease transferred to man is- a)Anthrax
- b)Rinderpest
- c)Footrot
- d)Diarrhoea
Correct answer is option 'A'. Can you explain this answer?
Cattle disease transferred to man is
a)
Anthrax
b)
Rinderpest
c)
Footrot
d)
Diarrhoea
|
|
Tom Tattle answered |
The correct answer is Anthrax.
Key Points
- This disease is also known as splenic feverdue to the fact that there isan extensive enlargement of the spleen(splenomegaly) due to this infection.
- The disease is caused by bacteriaknown asBacillus anthracis.
- Symptoms:
- There is elevation of body temperature(104 to 108°C).
- Animal refuses to eatand there isthe development of bloat.
- Animal isextremely depressedand showsdistressed breathing.
- Extreme dyspnoealeads tomouth breathingdue tooxygen hunger.
- Sudden death within 48 hrsof illness of animal.
Additional Information
- Preventive measures:
- Periodical and regular vaccinationshould be done.
- Strict quarantine measuresin anthrax prone areas.
- Preventing theintroduction of infected animalsintodisease-free areas.
- Carcasses should not be openedas it may contaminate the pasture.
- The adjacent areas of the dead and infected animalsshould be thoroughly disinfected with3% peracetic acidor10% caustic sodaor10% formalin.
Read the statements and choose the correct option:Assertion (A): FMD outbreaks are usually controlled by locking and restricting the movement of affected animals, and cleansing and disinfecting equipment and vehicles used.Reasoning (R): FMD(Food and mouth) is caused by an Aphthovirus of the family Picornaviridae- a)Both (A) and ( R) are true and (R) is the correct explanation of (A).
- b)Both (A) and (R) are true but ( R) is not the correct explanation of (A).
- c)(A) is true but (R) is false
- d)(R) is true but (A) is false
Correct answer is option 'A'. Can you explain this answer?
Read the statements and choose the correct option:
Assertion (A): FMD outbreaks are usually controlled by locking and restricting the movement of affected animals, and cleansing and disinfecting equipment and vehicles used.
Reasoning (R): FMD(Food and mouth) is caused by an Aphthovirus of the family Picornaviridae
a)
Both (A) and ( R) are true and (R) is the correct explanation of (A).
b)
Both (A) and (R) are true but ( R) is not the correct explanation of (A).
c)
(A) is true but (R) is false
d)
(R) is true but (A) is false
|
Yogesh Dwivedi answered |
The correct option is the digestive route.
Explanation:
- Foot and mouth disease (FMD) in cattle is caused by a virus - picornavirus. The virus has seven serotypes A, O, C, SAT1, SAT2, SAT3 and Asia1
- It is a highly infectious disease that affects the cloven-hoofed animals (animals having divided hoofs) like cows, buffalo, deer, pigs, goats, etc.
- Symptoms include the appearance of vesicles (fluid-filled blisters) between the toes and heel, lack of appetite, shivering & reduced milk production.
- Foot and Mouth Disease gets transmitted through the digestive route.
Preventive measures:
- FMD outbreaks are usually controlled by locking and restricting the movement of affected animals, and cleansing and disinfecting equipment and vehicles used.
- Infected materials used while dealing with the animals, must be disposed of properly by burial, etc.
- The conventional method of treating infected animals mainly involves the use of antibiotics, flunixin meglumine, and mild disinfectants (Radostitis et al. 2000).
Additional Information
Various diseases in farm animals are transmitted through the following routes:
- Respiratory route: When an infected animal coughs or sneezes, the pathogens are transmitted to other animals. For example, the spread of Influenza happens through the respiratory route.
- Digestive route: When grass or water contaminated with dung or secretions of the infected animal is consumed by healthy animals, the disease gets transmitted. For example, Foot and Mouth Disease gets transmitted through the digestive route.
- Through wounds: In case of an injury or wound on the animal, some of the pathogens can enter the body of healthy animals through the wounded part and cause diseases like Tetanus.
- Other routes: Pathogens may transmit diseases among animals through vectors like ticks, mites, fleas, etc. For example, the Babesia pathogen spreads through ticks. Some pathogens also spread through the reproductive tract and cause diseases like Brucellosis.
Which of the following pair is correct? I. Plant cell - number of small vacuoles II. Animal cell - big central vacuole- a)Both I and II
- b)Only I
- c)Only II
- d)Neither I nor II
Correct answer is option 'D'. Can you explain this answer?
Which of the following pair is correct?
I. Plant cell - number of small vacuoles
II. Animal cell - big central vacuole
a)
Both I and II
b)
Only I
c)
Only II
d)
Neither I nor II
|
|
KnowIT answered |
Explanation:
Cell:
- The cell is the fundamental unit of life. All the life activities are carried out by cells.
- The organisms are classified based on the number of cells present in them.
- Unicellular organisms are single-celled, while multicellular organisms have a large number of cells.
- Differences between the plant cell and animal:
- The cell wall is present in Plant cells while it is absent in an animal cells. A cell wall gives mechanical support to a plant cell.
- Plants have both a cell wall that is made up of cellulose and a cell membrane (plasma membrane). The cell wall is, a rigid membrane matrix found on the surface of all plant cells whose primary role is to protect the cell and its content.
- Plant cells have a large central vacuole that can occupy up to 90% of the cell’s volume. Animal cells may have many small vacuoles, a lot smaller than the plant cell.
So, both statement is incorrect.
Cuscuta is an example of:- a)autotroph
- b)parasite
- c)saprotroph
- d)host
Correct answer is option 'B'. Can you explain this answer?
a)
autotroph
b)
parasite
c)
saprotroph
d)
host
|
|
KnowIT answered |
Concept:
- Nutrition is a process by which an organism consumes and uses food materials.
- There are various modes of nutrition mainly, Autotrophic, Heterotrophic, Chemoautotrophic, Saprophytic,etc.
- Parasitismis a type of heterotrophic nutrition.
Explanation:
Cuscuta:
- < />Cuscutais aparasitic plant.
- Since Cuscutadoes not have chlorophyll,it cannot synthesize its own food by photosynthesis.
- It takes readymade food from the plant on which it is climbing.
- The plant on which it climbs is called a host.
- Since it deprives the host of valuable nutrients, it is called a parasite.
- It is yellow and tubular in structure twining around the stem and branches of a tree.
- Other parasitic plants are - Rafflesia, Viscum, Nuytsia floribunda.
- Parasitic plants cause damage to the host plant.
Thus, Cuscuta is a parasite.
Additional Information
- Holophytic or autotrophic nutrition:In this type of nutrition the organisms prepare their food by themselves. Eg - green plants.
- Saprobiotic nutrition:In this type of nutrition the organism depends on the dead and decaying matter of other organisms. Eg - fungi
Basva was telling his friend "It is now twenty days since the onion seeds were sown. The onion plants have started to sprout. Along with onion plants, weeds have also come up. Weeds grow in fields and gardens, without being planted. Appa says that we must remove the weeds." Why do you think the weeds need to removed? - a)Weeds take up most of the water and fertilisers
- b)If there are too many weeds, then the onion plants will not be healthy
- c)Weeds bring insects that feed on the onion plant
- d)Both 1 and 2
Correct answer is option 'D'. Can you explain this answer?
a)
Weeds
take up most of the water and fertilisers
b)
If there are too many weeds, then the onion plants will not be healthy
c)
Weeds bring insects that feed on the onion plant
d)
Both 1 and 2
|
|
Ritesh Kumar Shivhare answered |
Concept:
Onion farming:
- Onion is the crop that is cultivated during the month of July.
- For cultivating onions the farmer has to dig the soil and make it soft.
- It is also necessary to drop the right amount of seeds at a regular distance during sowing seeds.
Explanation:
Problems of weed during onion farming:
- After twenty days after the seeds were sown the onion plants started to sprout.
- Along with onion plants, weeds have also come up.
- Weeds grow in fields and gardens, without being planted.
- It is necessary that the farmer must remove the weeds so that they do not take up most of the water and fertilisers.
- If there are too many weeds, then the onion plants will not be healthy.
Thus,
the weeds need to be removed because-
1) Weeds
take up most of the water and fertilisers- Correct.
2) If there are too many weeds, then the onion plants will not be healthy- Correct.
3) Weeds bring insects that feed on the onion plant- Incorrect
So, options 1 and 2 both are correct.
Additional Information
Some farming implements used in onion farming:
- Khunti:
- An iron rod to dig the soil, loosen it and make it soft.
- Kurige:
- Use to plough the fields
- Bullocks pull the Kurige which makes the field ready for seed sowing.
- illige:
- The illige is sharp.
- It is used to cut the dried leaves from the top of the onions.
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EVS & Pedagogy Paper 1 for CTET & TET Exams
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