All questions of Community Ecology for Grade 9 Exam
Ecosystem follows:- a)only first law of thermodynamics
- b)only second law of thermodynamics
- c)both first and second laws of thermodynamics
- d)only third law of thermodynamics
Correct answer is option 'C'. Can you explain this answer?
Ecosystem follows:
a)
only first law of thermodynamics
b)
only second law of thermodynamics
c)
both first and second laws of thermodynamics
d)
only third law of thermodynamics
|
Vijay Bansal answered |
The first law, also known as Law of Conservation of Energy, states that energy cannot be created or destroyed in an isolated system. The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero.
Secondary productivity is the rate of formation of new organic matter by- a)Decomposer
- b)Consumer
- c)Producer
- d)Parasite
Correct answer is option 'B'. Can you explain this answer?
Secondary productivity is the rate of formation of new organic matter by
a)
Decomposer
b)
Consumer
c)
Producer
d)
Parasite
|
Rajeev Saxena answered |
Secondary productivity is the rate of formation of new organic matter by consumers. primary productivity depends on the producers inhabiting a particular area. Decomposers break down complex organic matter. Into inorganic substance like carbon dioxide water and nutrients. Parasitic species food on the body of other organisms.
Correct sequence for decomposition process is:
- a)fragmentation -> leaching -> catabolism -> mineralisation
- b)fragmentation -> leaching -> mineralisation -> humification
- c)leaching -> fragmentation -> humification -> mineralisation
- d)fragmentation -> catabolism -> leaching -> mineralisation
Correct answer is option 'D'. Can you explain this answer?
Correct sequence for decomposition process is:
a)
fragmentation -> leaching -> catabolism -> mineralisation
b)
fragmentation -> leaching -> mineralisation -> humification
c)
leaching -> fragmentation -> humification -> mineralisation
d)
fragmentation -> catabolism -> leaching -> mineralisation
|
Gaurav Kumar answered |
Decomposition is the process that involves the breakdown of complex organic matter or biomass from the body of dead plants and animals with the help of decomposers into inorganic raw materials such as carbon dioxide, water, and other nutrients.
The various processes involved in decomposition are as follows:
➢ Fragmentation
➢ Fragmentation
- It is the first step in the process of decomposition.
- It involves the breakdown of detritus into smaller pieces by the action of detritivores such as earthworms.
➢ Leaching
- It is a process where the water soluble nutrients go down into the soil layers and get locked as unavailable salts.
➢ Catabolism
- It is a process in which bacteria and fungi degrade detritus through various enzymes into smaller pieces.
➢ Humification
- The next step is humification which leads to the formation of a dark-coloured colloidal substance called humus, which acts as reservoir of nutrients for plants.
➢ Mineralization
- The humus is further degraded by the action of microbes, which finally leads to the release of inorganic nutrients into the soil.
- This process of releasing inorganic nutrients from the humus is known as mineralization.
Ecosystem is- a)Open
- b)Both open and close
- c)Close
- d)Neither opened nor closed
Correct answer is option 'A'. Can you explain this answer?
Ecosystem is
a)
Open
b)
Both open and close
c)
Close
d)
Neither opened nor closed
|
|
Rajat Kapoor answered |
An ecosystem includes all of the living things (plants, animals and organisms) in a given area, interacting with each other, and also with their non-living environments (weather, earth, sun, soil, climate, atmosphere). Ecosystems are the foundations of the Biosphere and they determine the health of the entire earth system.
Which of the following is correct?a)GPP + NPP = Rb)NPP – R = GPPc)GPP – R = NPPd)NPP – GPP = RCorrect answer is option 'C'. Can you explain this answer?
|
Srishti Sen answered |
Net primary productivity (NPP) is equal to Gross primary productivity (GPP) minus Respiration loss (R). NPP is the available biomass for the consumption of heterotrophs in the ecosystem.
A detritus food chain will start with which of the following?- a)Protozoans
- b)Rhizophora species
- c)Bacteria & fungi
- d)Earthworm
Correct answer is option 'C'. Can you explain this answer?
A detritus food chain will start with which of the following?
a)
Protozoans
b)
Rhizophora species
c)
Bacteria & fungi
d)
Earthworm
|
Rajesh Datta answered |
A detritus food chain begins with dead organic matter. It is made of decomposers which are heterotrophic organism fungi and bacteria.Rhizophora species is a saprophyticheterotrophs.
Which one of the following is the most important service provided by ecosystems?- a)soil formation
- b)aesthetic values
- c)pollination
- d)water purification
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is the most important service provided by ecosystems?
a)
soil formation
b)
aesthetic values
c)
pollination
d)
water purification
|
Mehul Iyer answered |
Ecosystem services includes all activities performed by nature to benefits of human beings. The most important ecological service includes soil formation. Soil is essential for growth of plants that provide food to all living forms.
Humus will never be:
- a)Good for plant growth.
- b)Resistant to microbial action.
- c)Reservoir of nutrients.
- d)all of these
- e)None of these.
Correct answer is option 'E'. Can you explain this answer?
Humus will never be:
a)
Good for plant growth.
b)
Resistant to microbial action.
c)
Reservoir of nutrients.
d)
all of these
e)
None of these.
|
|
Rohan Singh answered |
- Humus is a dark brown amorphous gummy substance formed by partial decomposition of plant and animal matter.
- It is not good for plant growth.
- Humus is quite resistant to microbial action.
- It is a reservoir of nutrients and is helpful in the maintenance of soil moisture as well as aeration.
Hence, None of these statements is correct about Humus.
There are only 4 or 5 trophic levels in food chain of an ecosystem due to :- a)Limited number of members in biotic community
- b)Loss of energy at successive levels
- c)Carrying capacity
- d)Environmental resistance
Correct answer is option 'B'. Can you explain this answer?
There are only 4 or 5 trophic levels in food chain of an ecosystem due to :
a)
Limited number of members in biotic community
b)
Loss of energy at successive levels
c)
Carrying capacity
d)
Environmental resistance
|
Krish Saha answered |
In most of the food chain of ecosystem only 4 to 5 trophic levels are present because loss of energy at successive levels is very high. Only 10% of energy is transferred to next trophic level.
Which of the following is not an ecological parameter?- a)Stratification
- b)Number
- c)Energy
- d)Biomass
Correct answer is option 'A'. Can you explain this answer?
Which of the following is not an ecological parameter?
a)
Stratification
b)
Number
c)
Energy
d)
Biomass
|
Mahesh Saini answered |
Ecological parameter includes, biomass, energy and number of individual in the ecosystem. Stratification is not a part of ecological parameter.
Conditions favouring decomposition are :- a)high temperature and intermediate humidity
- b)low temperature and low humidity
- c)low temperature and high humidity
- d)high temperature and low humidity
Correct answer is option 'A'. Can you explain this answer?
Conditions favouring decomposition are :
a)
high temperature and intermediate humidity
b)
low temperature and low humidity
c)
low temperature and high humidity
d)
high temperature and low humidity
|
|
Tarun Saha answered |
**Explanation:**
Decomposition is the process by which organic matter breaks down into simpler substances, such as carbon dioxide, water, and minerals. It is a natural process that is essential for nutrient recycling in ecosystems.
Conditions that favor decomposition are important to understand because they can determine the rate at which organic matter decomposes and the types of organisms involved in the process.
The correct answer to the given question is option 'A', which states that high temperature and intermediate humidity favor decomposition. Let's understand why this is the case:
**1. High Temperature:**
- Decomposition is an enzymatic process, meaning it is facilitated by the action of enzymes produced by microorganisms, such as bacteria and fungi.
- Enzymatic reactions are generally more efficient at higher temperatures because they increase the rate of biochemical reactions.
- High temperatures accelerate the metabolic activity of decomposer organisms, leading to faster decomposition rates.
**2. Intermediate Humidity:**
- Decomposer organisms require a certain level of moisture to carry out their metabolic processes effectively.
- If the humidity is too high, the excessive moisture can create an anaerobic environment (lack of oxygen) that is unfavorable for many decomposer organisms.
- If the humidity is too low, the lack of moisture restricts the activity of decomposer organisms.
- Intermediate humidity provides the ideal conditions for decomposer organisms to thrive and efficiently decompose organic matter.
**Conclusion:**
In conclusion, the correct answer to the given question is option 'A' (high temperature and intermediate humidity) because these conditions provide the ideal environment for the activity of decomposer organisms, leading to faster and more efficient decomposition of organic matter.
Decomposition is the process by which organic matter breaks down into simpler substances, such as carbon dioxide, water, and minerals. It is a natural process that is essential for nutrient recycling in ecosystems.
Conditions that favor decomposition are important to understand because they can determine the rate at which organic matter decomposes and the types of organisms involved in the process.
The correct answer to the given question is option 'A', which states that high temperature and intermediate humidity favor decomposition. Let's understand why this is the case:
**1. High Temperature:**
- Decomposition is an enzymatic process, meaning it is facilitated by the action of enzymes produced by microorganisms, such as bacteria and fungi.
- Enzymatic reactions are generally more efficient at higher temperatures because they increase the rate of biochemical reactions.
- High temperatures accelerate the metabolic activity of decomposer organisms, leading to faster decomposition rates.
**2. Intermediate Humidity:**
- Decomposer organisms require a certain level of moisture to carry out their metabolic processes effectively.
- If the humidity is too high, the excessive moisture can create an anaerobic environment (lack of oxygen) that is unfavorable for many decomposer organisms.
- If the humidity is too low, the lack of moisture restricts the activity of decomposer organisms.
- Intermediate humidity provides the ideal conditions for decomposer organisms to thrive and efficiently decompose organic matter.
**Conclusion:**
In conclusion, the correct answer to the given question is option 'A' (high temperature and intermediate humidity) because these conditions provide the ideal environment for the activity of decomposer organisms, leading to faster and more efficient decomposition of organic matter.
Available organic matter for herbivores is represented by:- a)Secondary productivity
- b)GPP
- c)NPP
- d)All the these
Correct answer is option 'C'. Can you explain this answer?
Available organic matter for herbivores is represented by:
a)
Secondary productivity
b)
GPP
c)
NPP
d)
All the these
|
Charvi Shah answered |
The organic matter available for herbivores is called net primary productivity (NPP). Total amount of organic matter fix during photosynthesis is called Gross primary productivity (GPP).
Which of the following pyramid/s is/are inverted?- a)pyramid of number in an aquatic system
- b)pyramid of biomass in a grassland system
- c)pyramid of biomass in an aquatic system
- d)pyramid of number in a grassland system
Correct answer is option 'C'. Can you explain this answer?
Which of the following pyramid/s is/are inverted?
a)
pyramid of number in an aquatic system
b)
pyramid of biomass in a grassland system
c)
pyramid of biomass in an aquatic system
d)
pyramid of number in a grassland system
|
Snehal Shah answered |
The pyramid of biomass in an aquatic system is always inverted. Sharp decrease in biomass results into inverted pyramids.
Germplasm conservation at liquid N2 temperature is- a)Stratification
- b)Cryopreservation
- c)Scarification
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Germplasm conservation at liquid N2 temperature is
a)
Stratification
b)
Cryopreservation
c)
Scarification
d)
None of the above
|
Kritika Singh answered |
Yes it is cryopreservation, done at minus 196 degree Celsius
The important steps in the process of decomposition are- a)Fragmentation and mineralisation
- b)Leaching and catabolism
- c)Humification and mineralisation
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
The important steps in the process of decomposition are
a)
Fragmentation and mineralisation
b)
Leaching and catabolism
c)
Humification and mineralisation
d)
All of the above
|
|
Vijay Bansal answered |
The important steps in the process of decomposition are fragmentation, leaching, catabolism, humification and mineralisation.
Flow of energy in our ecosystem takes place :- a)only in one direction
- b)possible in two directions
- c)in three dimensions
- d)may occur in multiple directions
Correct answer is option 'A'. Can you explain this answer?
Flow of energy in our ecosystem takes place :
a)
only in one direction
b)
possible in two directions
c)
in three dimensions
d)
may occur in multiple directions
|
Aniket Chawla answered |
In ecosystem, flow of energy takes place in only one direction. The flow of energy takes place from producers to final consumers. Energy present in one trophic levels neversreturn back to producer.
Forest controls drought through- a)Functioning as water shed.
- b)Lot of water plant
- c)Retention of water and prevention of soil erosion.
- d) Increasing rainfall
Correct answer is option 'D'. Can you explain this answer?
Forest controls drought through
a)
Functioning as water shed.
b)
Lot of water plant
c)
Retention of water and prevention of soil erosion.
d)
Increasing rainfall
|
Akshat Joshi answered |
The correct answer is option 'D' i.e., retention of water and prevention of soil erosion.
Explanation:
Forests are essential for the survival of life on earth. They are responsible for various ecological, environmental, and social benefits. Forests play a crucial role in controlling drought by retaining water and preventing soil erosion. Let's discuss how forests control drought through water retention and soil erosion prevention:
Retention of water:
Forests help in retaining water in the following ways:
1. Watershed: Forests act as a water catchment area and function as a natural watershed. They store and release water gradually, reducing the risk of floods and droughts.
2. Groundwater recharge: Forests help in recharging groundwater by allowing rainwater to seep into the soil, thus replenishing underground water resources.
3. Transpiration: Trees in the forest transpire water, which helps in the formation of clouds and precipitation, leading to increased rainfall.
Prevention of soil erosion:
Forests help in preventing soil erosion in the following ways:
1. Root systems: Trees in the forest have deep root systems that hold the soil in place and prevent it from eroding.
2. Canopy cover: The canopy cover of trees in the forest acts as a barrier, reducing the impact of raindrops on the soil surface and preventing soil erosion.
3. Organic matter: Forests are rich in organic matter, which helps in improving soil structure, reducing soil erosion, and retaining water.
Conclusion:
Forests play a crucial role in controlling drought by retaining water and preventing soil erosion. Therefore, it is important to conserve and protect forests to ensure a sustainable future for all.
Explanation:
Forests are essential for the survival of life on earth. They are responsible for various ecological, environmental, and social benefits. Forests play a crucial role in controlling drought by retaining water and preventing soil erosion. Let's discuss how forests control drought through water retention and soil erosion prevention:
Retention of water:
Forests help in retaining water in the following ways:
1. Watershed: Forests act as a water catchment area and function as a natural watershed. They store and release water gradually, reducing the risk of floods and droughts.
2. Groundwater recharge: Forests help in recharging groundwater by allowing rainwater to seep into the soil, thus replenishing underground water resources.
3. Transpiration: Trees in the forest transpire water, which helps in the formation of clouds and precipitation, leading to increased rainfall.
Prevention of soil erosion:
Forests help in preventing soil erosion in the following ways:
1. Root systems: Trees in the forest have deep root systems that hold the soil in place and prevent it from eroding.
2. Canopy cover: The canopy cover of trees in the forest acts as a barrier, reducing the impact of raindrops on the soil surface and preventing soil erosion.
3. Organic matter: Forests are rich in organic matter, which helps in improving soil structure, reducing soil erosion, and retaining water.
Conclusion:
Forests play a crucial role in controlling drought by retaining water and preventing soil erosion. Therefore, it is important to conserve and protect forests to ensure a sustainable future for all.
Producers in the aquatic ecosystem are :- a)Shrubs
- b)Herbacious plants
- c)Phytoplanktons
- d)Zooplanktons
Correct answer is option 'C'. Can you explain this answer?
Producers in the aquatic ecosystem are :
a)
Shrubs
b)
Herbacious plants
c)
Phytoplanktons
d)
Zooplanktons
|
Ishani Nambiar answered |
Phytoplanktons are small floating photosynthetic unicellular plant. In the aquatic ecosystem phytoplankton are producers that fix solar energy by the process of photosynthesis.
Which of the following ecological pyramid is always erect and upright?- a)pyramid of biomass
- b)pyramid of energy
- c)pyramid of number
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
Which of the following ecological pyramid is always erect and upright?
a)
pyramid of biomass
b)
pyramid of energy
c)
pyramid of number
d)
none of these
|
|
Ishani Nambiar answered |
Pyramid of energy is always erect and upright because the amount of energy get reduce at each trophic level from prouder to consumers.
The decomposition of organic matter is brought about by- a)Protozoans
- b)Plants
- c)Microorganisms
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
The decomposition of organic matter is brought about by
a)
Protozoans
b)
Plants
c)
Microorganisms
d)
None of the above
|
Shruti Bora answered |
Microorganisms like bacteria etc decompose organic matter.
Amount of biomass produced per unit area by green plants is called?- a)Respiration
- b)Primary productivity
- c)Secondary productivity
- d)Tertiary productivity
Correct answer is option 'B'. Can you explain this answer?
Amount of biomass produced per unit area by green plants is called?
a)
Respiration
b)
Primary productivity
c)
Secondary productivity
d)
Tertiary productivity
|
Arpita Tiwari answered |
Primary productivity is the amount of biomass produced per unit area by green plants in an ecosystem. Producers fix the solar energy by the process of photosynthesis.
Speed of decomposition will be:- a)fast if detritus is rich in simple sugars
- b)slow if detritus contains water soluble substances like sugars
- c)fast if detritus is rich in lignin
- d)slow if detritus lacks chitin
Correct answer is option 'A'. Can you explain this answer?
Speed of decomposition will be:
a)
fast if detritus is rich in simple sugars
b)
slow if detritus contains water soluble substances like sugars
c)
fast if detritus is rich in lignin
d)
slow if detritus lacks chitin
|
Mrinalini Bajaj answered |
In detritus food chain, speed of decomposition will be fast if detritus is rich in simple sugar that can be easily decomposed into glucose by saprophytes that includes bacteria and fungi.
What is the rate at which solar energy is converted and stored by the producers per unit area over a time period called?- a)Tertiary productivity
- b)Primary productivity
- c)Gross primary productivity
- d)Net productivity
Correct answer is option 'A'. Can you explain this answer?
What is the rate at which solar energy is converted and stored by the producers per unit area over a time period called?
a)
Tertiary productivity
b)
Primary productivity
c)
Gross primary productivity
d)
Net productivity
|
Top Rankers answered |
The rate at which solar energy is converted and stored by the producers per unit area over a time period is called primary productivity. The solar energy is converted into usable form by plants with the help of photosynthesis.
Biosphere means- a)Atmosphere, lithosphere and hydrosphere
- b)Lithosphere and ionosphere
- c)Hydrosphere, lithosphere and ionosphere
- d)Atmosphere
Correct answer is option 'A'. Can you explain this answer?
Biosphere means
a)
Atmosphere, lithosphere and hydrosphere
b)
Lithosphere and ionosphere
c)
Hydrosphere, lithosphere and ionosphere
d)
Atmosphere
|
Rajni Kokate answered |
Biosphere is one of the layers surrounding the earth along with the lithosphere(land) ,hydrosphere(water),atmosphere (air).
The biomass available for consumption to heterotrophs and the rate of formation of new organic matter by consumers are defined as- a)Net primary productivity and gross primary productivity, respectively.
- b)Gross primary productivity and net primary productivity, respectively.
- c)Gross primary productivity and secondary productivity, respectively.
- d)Net primary productivity and secondary productivity, respectively.
Correct answer is option 'D'. Can you explain this answer?
The biomass available for consumption to heterotrophs and the rate of formation of new organic matter by consumers are defined as
a)
Net primary productivity and gross primary productivity, respectively.
b)
Gross primary productivity and net primary productivity, respectively.
c)
Gross primary productivity and secondary productivity, respectively.
d)
Net primary productivity and secondary productivity, respectively.
|
Maulik Gupta answered |
The correct answer is option D, Net primary productivity and secondary productivity, respectively.
Explanation:
- Net primary productivity (NPP) is the biomass available for consumption to heterotrophs after the autotrophs have utilized some of the organic matter for their own metabolism through respiration.
- Secondary productivity is the rate of formation of new organic matter by consumers (heterotrophs) that eat the autotrophs or other heterotrophs.
- Gross primary productivity (GPP) is the total amount of organic matter produced by autotrophs through photosynthesis, including the organic matter used for their own respiration.
- Gross secondary productivity is the total amount of organic matter assimilated by consumers, including the organic matter lost through excretion and egestion.
Therefore, the correct answer is option D, as NPP and secondary productivity are the two parameters that indicate the amount of organic matter available for consumption to higher trophic levels in an ecosystem.
Explanation:
- Net primary productivity (NPP) is the biomass available for consumption to heterotrophs after the autotrophs have utilized some of the organic matter for their own metabolism through respiration.
- Secondary productivity is the rate of formation of new organic matter by consumers (heterotrophs) that eat the autotrophs or other heterotrophs.
- Gross primary productivity (GPP) is the total amount of organic matter produced by autotrophs through photosynthesis, including the organic matter used for their own respiration.
- Gross secondary productivity is the total amount of organic matter assimilated by consumers, including the organic matter lost through excretion and egestion.
Therefore, the correct answer is option D, as NPP and secondary productivity are the two parameters that indicate the amount of organic matter available for consumption to higher trophic levels in an ecosystem.
If the number of producers in a pond ecosystem is approx 10 million then the number of top carnivore (in million) which it can support may be:- a)20
- b)2
- c)11
- d)50
Correct answer is option 'B'. Can you explain this answer?
If the number of producers in a pond ecosystem is approx 10 million then the number of top carnivore (in million) which it can support may be:
a)
20
b)
2
c)
11
d)
50
|
Arnav Iyer answered |
In a food chain, number of organisms reduce from producer to carnivores at each trophic levels. So, the number of carnivores will be less than the prouder which is less than 10 million.
If 20000J energy is present in transducers then 3°consumers will get:- a)20J
- b)200J
- c)10000J
- d)2000J
Correct answer is option 'A'. Can you explain this answer?
If 20000J energy is present in transducers then 3°consumers will get:
a)
20J
b)
200J
c)
10000J
d)
2000J
|
|
Anuj Pillai answered |
Explanation:
To understand the answer to this question, we need to consider the concept of energy distribution among multiple consumers.
Energy Distribution:
When energy is distributed among multiple consumers, the total energy remains constant. In this case, we have a total of 20,000 J of energy available. We need to distribute this energy among 3 consumers.
Calculation:
To find out how much energy each consumer will receive, we divide the total energy by the number of consumers.
Total energy = 20,000 J
Number of consumers = 3
Energy per consumer = Total energy / Number of consumers
Energy per consumer = 20,000 J / 3
Energy per consumer ≈ 6,666.67 J
Answer:
According to the options provided, the closest answer to 6,666.67 J is option 'A' which is 20 J. Therefore, each consumer will receive approximately 20 J of energy.
Explanation of the Correct Answer:
Option 'A' states that each consumer will get 20 J of energy. This means that when the total energy of 20,000 J is distributed among 3 consumers, each consumer will receive approximately 20 J of energy.
Reasoning:
To find the correct answer, we need to divide the total energy by the number of consumers (20,000 J / 3). This calculation results in approximately 6,666.67 J per consumer. Since option 'A' is the closest answer to this value, it is the correct answer.
Summary:
In summary, when 20,000 J of energy is distributed among 3 consumers, each consumer will receive approximately 20 J of energy. This is calculated by dividing the total energy by the number of consumers.
To understand the answer to this question, we need to consider the concept of energy distribution among multiple consumers.
Energy Distribution:
When energy is distributed among multiple consumers, the total energy remains constant. In this case, we have a total of 20,000 J of energy available. We need to distribute this energy among 3 consumers.
Calculation:
To find out how much energy each consumer will receive, we divide the total energy by the number of consumers.
Total energy = 20,000 J
Number of consumers = 3
Energy per consumer = Total energy / Number of consumers
Energy per consumer = 20,000 J / 3
Energy per consumer ≈ 6,666.67 J
Answer:
According to the options provided, the closest answer to 6,666.67 J is option 'A' which is 20 J. Therefore, each consumer will receive approximately 20 J of energy.
Explanation of the Correct Answer:
Option 'A' states that each consumer will get 20 J of energy. This means that when the total energy of 20,000 J is distributed among 3 consumers, each consumer will receive approximately 20 J of energy.
Reasoning:
To find the correct answer, we need to divide the total energy by the number of consumers (20,000 J / 3). This calculation results in approximately 6,666.67 J per consumer. Since option 'A' is the closest answer to this value, it is the correct answer.
Summary:
In summary, when 20,000 J of energy is distributed among 3 consumers, each consumer will receive approximately 20 J of energy. This is calculated by dividing the total energy by the number of consumers.
Functional and dynamic unit of nature where living and non-living components interact with each-other is:- a)Biome
- b)Community
- c)Tropic structure
- d)Ecosystem
Correct answer is option 'D'. Can you explain this answer?
Functional and dynamic unit of nature where living and non-living components interact with each-other is:
a)
Biome
b)
Community
c)
Tropic structure
d)
Ecosystem
|
Pallabi Reddy answered |
Ecosystem is the functional and dynamic unit of nature where living and non-living components interact with each other for flow of energy and biomass from producer to consumers.
Assertion (A): Nutrient cycling includes both gaseous and sedimentary cycles, which play crucial roles in ecosystem health.Reason (R): The gaseous cycle relies solely on the atmosphere as its reservoir, while the sedimentary cycle depends on the Earth's crust.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): Nutrient cycling includes both gaseous and sedimentary cycles, which play crucial roles in ecosystem health.
Reason (R): The gaseous cycle relies solely on the atmosphere as its reservoir, while the sedimentary cycle depends on the Earth's crust.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
|
Dipanjan Choudhary answered |
Understanding Nutrient Cycling
Nutrient cycling is essential for maintaining ecosystem health and can be categorized into two main types: gaseous cycles and sedimentary cycles.
Assertion (A): Nutrient Cycling Types
- Nutrient cycling encompasses both gaseous and sedimentary cycles.
- These cycles are crucial for ecosystem health as they facilitate the movement of essential nutrients.
Reason (R): Reservoirs of Nutrient Cycles
- The gaseous cycle primarily relies on the atmosphere as its reservoir.
- The sedimentary cycle is dependent on the Earth’s crust for its reservoirs.
Evaluating the Assertion and Reason
- Both Assertion (A) and Reason (R) are true statements.
- However, the Reason (R) does not serve as the correct explanation for the Assertion (A).
Why Option B is Correct?
- While it is accurate that nutrient cycling involves both gaseous and sedimentary cycles, the explanation provided in Reason (R) does not directly clarify why these cycles are important for ecosystem health.
- The reason only describes the reservoirs of the cycles but fails to connect this information to the overall significance of nutrient cycling in supporting life and maintaining ecosystem balance.
Conclusion
Thus, the answer is option 'B': both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. Understanding the distinction between these cycles and their roles enhances our comprehension of ecosystem dynamics.
Nutrient cycling is essential for maintaining ecosystem health and can be categorized into two main types: gaseous cycles and sedimentary cycles.
Assertion (A): Nutrient Cycling Types
- Nutrient cycling encompasses both gaseous and sedimentary cycles.
- These cycles are crucial for ecosystem health as they facilitate the movement of essential nutrients.
Reason (R): Reservoirs of Nutrient Cycles
- The gaseous cycle primarily relies on the atmosphere as its reservoir.
- The sedimentary cycle is dependent on the Earth’s crust for its reservoirs.
Evaluating the Assertion and Reason
- Both Assertion (A) and Reason (R) are true statements.
- However, the Reason (R) does not serve as the correct explanation for the Assertion (A).
Why Option B is Correct?
- While it is accurate that nutrient cycling involves both gaseous and sedimentary cycles, the explanation provided in Reason (R) does not directly clarify why these cycles are important for ecosystem health.
- The reason only describes the reservoirs of the cycles but fails to connect this information to the overall significance of nutrient cycling in supporting life and maintaining ecosystem balance.
Conclusion
Thus, the answer is option 'B': both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. Understanding the distinction between these cycles and their roles enhances our comprehension of ecosystem dynamics.
Ecological pyramids does not give any place to :- a)Saprophytes
- b)Transducers
- c)Predators
- d)Parasites
Correct answer is option 'A'. Can you explain this answer?
Ecological pyramids does not give any place to :
a)
Saprophytes
b)
Transducers
c)
Predators
d)
Parasites
|
|
Krish Saha answered |
In ecological pyramids, saprophytes do not have any place even though they play very vital role in ecosystem. This is because ecological pyramids does not take into account same species belonging to two or more trophic levels.
For greater efficiency a food chain must be:- a)without transducers
- b)shorter
- c)longer
- d)without microconsumers
Correct answer is option 'B'. Can you explain this answer?
For greater efficiency a food chain must be:
a)
without transducers
b)
shorter
c)
longer
d)
without microconsumers
|
Abhishek Desai answered |
For greater efficiency a food chain must have three to four trophic levels. At each trophic levels loss of energy is very high so very small amount of energy is left after there trophic level.
Assertion: If a predator is too efficient and overexploits its prey, then prey might become extinct.
Reason: The predator will also become extinct for lack of food.- a)Assertion is correct but reason is incorrect.
- b)Assertion is incorrect but reason is correct.
- c)Both assertion and reason are correct.
- d)Both assertion and reason are incorrect.
Correct answer is option 'C'. Can you explain this answer?
Assertion: If a predator is too efficient and overexploits its prey, then prey might become extinct.
Reason: The predator will also become extinct for lack of food.
Reason: The predator will also become extinct for lack of food.
a)
Assertion is correct but reason is incorrect.
b)
Assertion is incorrect but reason is correct.
c)
Both assertion and reason are correct.
d)
Both assertion and reason are incorrect.
|
Prasenjit Pillai answered |
If a predator is too efficient and overexploits its prey, then prey might become extinct. The predator will also become extinct for lack of food. Therefore, predators in nature are prudent.
Which of the following is an example of catabolism?- a)Breaking down of stones into smaller parts.
- b)Decrease in size of mountain.
- c)Breakdown of detritus by microbial enzymes.
- d)All of the these.
Correct answer is option 'C'. Can you explain this answer?
Which of the following is an example of catabolism?
a)
Breaking down of stones into smaller parts.
b)
Decrease in size of mountain.
c)
Breakdown of detritus by microbial enzymes.
d)
All of the these.
|
|
Abhishek Desai answered |
Breakdown of detritus by microbial enzymes into simple forms is called catabolism in which mass of the organisms decrease without any external reduction is size of the organisms.
Stability will be provided to the ecosystem by:- a)Ecological pyramids
- b)Food webs
- c)Decomposition
- d)Food chains
Correct answer is option 'B'. Can you explain this answer?
Stability will be provided to the ecosystem by:
a)
Ecological pyramids
b)
Food webs
c)
Decomposition
d)
Food chains
|
|
Krish Saha answered |
Food web is formed by interaction between a numbers of food chains having common members. Stability of ecosystem largely depends upon the kinds of food web exists in it for proper flow of energy.
Breakdown of detritus by microbial enzymes into simple forms is called?- a)Mineralization
- b)Catabolism
- c)Fragmentation
- d)Leaching
Correct answer is option 'B'. Can you explain this answer?
Breakdown of detritus by microbial enzymes into simple forms is called?
a)
Mineralization
b)
Catabolism
c)
Fragmentation
d)
Leaching
|
Naina Dey answered |
Catabolism - Breakdown of Detritus by Microbial Enzymes
Catabolism is the breakdown of complex organic matter into simpler compounds by the action of microbial enzymes. In the process of catabolism, detritus is decomposed and transformed into various forms that are readily available for use by other living organisms. This process is important for the maintenance of the ecosystem as it cycles nutrients and energy from dead organic matter back into the living world.
Mechanism of Catabolism
The process of catabolism involves the following steps:
1. Fragmentation: The detritus is fragmented into smaller particles by the action of physical and chemical forces.
2. Leaching: The soluble compounds are leached out of the detritus and are transported to other parts of the ecosystem.
3. Mineralization: The remaining organic matter is decomposed by the action of microbial enzymes into simpler forms such as carbon dioxide, water, and inorganic nutrients like nitrogen and phosphorus.
4. Catabolism: The simpler compounds are further broken down into energy and essential nutrients by the action of microbial enzymes.
Significance of Catabolism
Catabolism plays a crucial role in the cycling of nutrients and energy in the ecosystem. The breakdown of detritus by microbial enzymes releases essential nutrients like nitrogen and phosphorus into the soil, which can be taken up by plants for growth. The energy released during catabolism is also utilized by other living organisms in the ecosystem, thereby sustaining the food web. In addition, catabolism also helps in the removal of waste materials from the ecosystem.
Conclusion
Catabolism is a complex process that involves the breakdown of detritus into simpler forms by the action of microbial enzymes. This process is essential for the cycling of nutrients and energy in the ecosystem and helps in sustaining the food web. The significance of catabolism in the maintenance of the ecosystem cannot be overemphasized as it plays a crucial role in the removal of waste materials and the release of essential nutrients into the environment.
Catabolism is the breakdown of complex organic matter into simpler compounds by the action of microbial enzymes. In the process of catabolism, detritus is decomposed and transformed into various forms that are readily available for use by other living organisms. This process is important for the maintenance of the ecosystem as it cycles nutrients and energy from dead organic matter back into the living world.
Mechanism of Catabolism
The process of catabolism involves the following steps:
1. Fragmentation: The detritus is fragmented into smaller particles by the action of physical and chemical forces.
2. Leaching: The soluble compounds are leached out of the detritus and are transported to other parts of the ecosystem.
3. Mineralization: The remaining organic matter is decomposed by the action of microbial enzymes into simpler forms such as carbon dioxide, water, and inorganic nutrients like nitrogen and phosphorus.
4. Catabolism: The simpler compounds are further broken down into energy and essential nutrients by the action of microbial enzymes.
Significance of Catabolism
Catabolism plays a crucial role in the cycling of nutrients and energy in the ecosystem. The breakdown of detritus by microbial enzymes releases essential nutrients like nitrogen and phosphorus into the soil, which can be taken up by plants for growth. The energy released during catabolism is also utilized by other living organisms in the ecosystem, thereby sustaining the food web. In addition, catabolism also helps in the removal of waste materials from the ecosystem.
Conclusion
Catabolism is a complex process that involves the breakdown of detritus into simpler forms by the action of microbial enzymes. This process is essential for the cycling of nutrients and energy in the ecosystem and helps in sustaining the food web. The significance of catabolism in the maintenance of the ecosystem cannot be overemphasized as it plays a crucial role in the removal of waste materials and the release of essential nutrients into the environment.
A biome is- a)Sum of all ecosystems on the Earth
- b)Biotic components in a population
- c)Sum of ecosystems in a geographical area
- d)Biotic components in an ecosystem
Correct answer is option 'C'. Can you explain this answer?
A biome is
a)
Sum of all ecosystems on the Earth
b)
Biotic components in a population
c)
Sum of ecosystems in a geographical area
d)
Biotic components in an ecosystem
|
|
Vijay Bansal answered |
A biome is a large ecosystem, extending over a wide geographic region, characterized by certain dominant life-forms—most notably, trees or the lack thereof.Within a biome or ecosystem, the sum of all living organisms is referred to as the biological community.
The boundary or transition between two or more communities is called:- a)Ecotype
- b)Thermocline
- c)Ecotone
- d)Biome
Correct answer is option 'C'. Can you explain this answer?
The boundary or transition between two or more communities is called:
a)
Ecotype
b)
Thermocline
c)
Ecotone
d)
Biome
|
|
Rohit Shah answered |
An ecotone is a transition area between two biomes. It is where two communities meet and integrate. It may be narrow or wide, and it may be local (the zone between a field and forest) or regional (the transition between forest and grassland ecosystems). An ecotone may appear on the ground as a gradual blending of the two communities across a broad area, or it may manifest itself as a sharp boundary line.
The word ecotone was coined from a combination of eco(logy) plus -tone, from the Greek tonos or tension – in other words, a place where ecologies are in tension.
Primary consumer category in aquatic &/or terrestrial ecosystem will include :- a)Zooplanktons, frog tadpole, snails and tortoise
- b)Zooplanktons, frog, grasshoppers and hydra
- c)Frog tadpole, goat, bacteria and fungi
- d)Water insects, rabbits, frogs and snails
Correct answer is option 'A'. Can you explain this answer?
Primary consumer category in aquatic &/or terrestrial ecosystem will include :
a)
Zooplanktons, frog tadpole, snails and tortoise
b)
Zooplanktons, frog, grasshoppers and hydra
c)
Frog tadpole, goat, bacteria and fungi
d)
Water insects, rabbits, frogs and snails
|
Krish Patel answered |
Primary consumers obtain food from producers or autotrophs. In aquatic ecosystem phytoplankton are main prouder and zooplankton are primary consumers along with frog tadpole , snail and tortoise.
Which of the following is a unit of primary productivity?- a)g
- b)g-2 or kcal m-2
- c)kcal
- d)m
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a unit of primary productivity?
a)
g
b)
g-2 or kcal m-2
c)
kcal
d)
m
|
|
Stuti Sen answered |
Understanding Primary Productivity
Primary productivity refers to the rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem. It is a crucial measure for understanding energy flow and ecosystem health.
Units of Measurement
The correct answer for the unit of primary productivity is option b) g m-2 or kcal m-2. Let's break down why this is the case:
The Incorrect Options
Conclusion
In summary, primary productivity is best expressed in terms of biomass or energy per unit area, making option b) g m-2 or kcal m-2 the appropriate choice. Understanding these units is essential for evaluating ecosystem productivity and health in ecological studies.
Primary productivity refers to the rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem. It is a crucial measure for understanding energy flow and ecosystem health.
Units of Measurement
The correct answer for the unit of primary productivity is option b) g m-2 or kcal m-2. Let's break down why this is the case:
- g m-2: This unit indicates grams of biomass produced per square meter of area. It quantifies the mass of organic material generated by producers in a defined area over a specific time.
- kcal m-2: This unit measures the energy produced per square meter. It reflects the caloric value of organic material generated through photosynthesis, indicating how much energy is stored by plants in a given area.
The Incorrect Options
- Option a) g: While grams can measure biomass, it lacks the area and time components necessary for primary productivity. Therefore, it does not represent productivity effectively.
- Option c) kcal d: This unit suggests energy over time (daily) but does not include the area dimension. Without specifying area, it cannot measure productivity accurately.
Conclusion
In summary, primary productivity is best expressed in terms of biomass or energy per unit area, making option b) g m-2 or kcal m-2 the appropriate choice. Understanding these units is essential for evaluating ecosystem productivity and health in ecological studies.
Find the odd one out with respect to functional component of ecosystem- a)Productivity
- b)Stratification
- c)Decomposition
- d)Nutrient cycling
Correct answer is option 'B'. Can you explain this answer?
Find the odd one out with respect to functional component of ecosystem
a)
Productivity
b)
Stratification
c)
Decomposition
d)
Nutrient cycling
|
Ambition Institute answered |
The components of the ecosystem are seen to function as a unit when you consider the following aspects:
(i) Productivity;
(ii) Decomposition;
(iii) Energy flow; and
(iv) Nutrient cycling.
(i) Productivity;
(ii) Decomposition;
(iii) Energy flow; and
(iv) Nutrient cycling.
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