All questions of Conserving Biodiversity for Grade 9 Exam
The species becomes extinct most easily by:- a)Deforestation
- b)Heavy rains
- c)Urbanization
- d)Sliding of hills
Correct answer is option 'A'. Can you explain this answer?
The species becomes extinct most easily by:
a)
Deforestation
b)
Heavy rains
c)
Urbanization
d)
Sliding of hills
|
Roshni Basak answered |
Deforestation is the process of cutting down trees and clearing forests or woodlands, typically to make way for agricultural or urban development. This process has a significant impact on the environment and can result in the extinction of many species. The following are the reasons why deforestation is the main reason for species extinction:
1. Loss of habitat: Deforestation leads to the destruction of natural habitats of many species. Trees provide homes for animals, birds, and insects. When these habitats are destroyed, the animals are forced to migrate, which can lead to the extinction of the species.
2. Fragmentation of ecosystems: Deforestation fragments ecosystems, creating isolated pockets of habitat that are too small to sustain a viable population of many species. As a result, many species become extinct due to the lack of genetic diversity and the inability to find mates.
3. Climate change: Trees absorb carbon dioxide from the atmosphere and release oxygen. The destruction of forests leads to an increase in carbon dioxide levels, which contributes to climate change. Climate change can cause the extinction of many species that cannot adapt to the changing environment.
4. Hunting and poaching: Deforestation also leads to an increase in hunting and poaching activities, as many species are displaced from their natural habitats. This further increases the risk of extinction for many species.
In conclusion, deforestation is the main reason for species extinction as it leads to the loss of habitat, fragmentation of ecosystems, climate change, and an increase in hunting and poaching activities. It is, therefore, essential to implement measures to protect forests and prevent their destruction to conserve biodiversity and prevent the extinction of many species.
1. Loss of habitat: Deforestation leads to the destruction of natural habitats of many species. Trees provide homes for animals, birds, and insects. When these habitats are destroyed, the animals are forced to migrate, which can lead to the extinction of the species.
2. Fragmentation of ecosystems: Deforestation fragments ecosystems, creating isolated pockets of habitat that are too small to sustain a viable population of many species. As a result, many species become extinct due to the lack of genetic diversity and the inability to find mates.
3. Climate change: Trees absorb carbon dioxide from the atmosphere and release oxygen. The destruction of forests leads to an increase in carbon dioxide levels, which contributes to climate change. Climate change can cause the extinction of many species that cannot adapt to the changing environment.
4. Hunting and poaching: Deforestation also leads to an increase in hunting and poaching activities, as many species are displaced from their natural habitats. This further increases the risk of extinction for many species.
In conclusion, deforestation is the main reason for species extinction as it leads to the loss of habitat, fragmentation of ecosystems, climate change, and an increase in hunting and poaching activities. It is, therefore, essential to implement measures to protect forests and prevent their destruction to conserve biodiversity and prevent the extinction of many species.
Amongst the animal groups given below, which one has the highest percentage of endangered species?- a)Mammals
- b)Insect
- c)Amphibians
- d)Reptiles
Correct answer is option 'C'. Can you explain this answer?
Amongst the animal groups given below, which one has the highest percentage of endangered species?
a)
Mammals
b)
Insect
c)
Amphibians
d)
Reptiles
|
Vijay Bansal answered |
Presently, 12% all the birds species, 23% all mammals species, 31% all gymnosperms species and 32% all amphibian species in world face the threat of extinctions.
The active chemical drug reserpine is obtained formA: Datura B: Rauwolfia C: Atropa D: PapaverCorrect answer is option 'D'. Can you explain this answer?
|
Rohit Shah answered |
Rauwolfia vomitoria is the source of active chemical drug reserpine, which is prescribed in hypertension and act as tranquilliser.
Datura is a plant with hallucinogenic properties. Drug belladonna is obtained from Atropa belladonna and drug. Opium is obtained from Papaver somniferum.
Which of the following are also called lungs of our planet?
- a)Himalayas
- b)Amazonian rainforests
- c)Mediterranean Basin
- d)Western Ghats
Correct answer is option 'B'. Can you explain this answer?
Which of the following are also called lungs of our planet?
a)
Himalayas
b)
Amazonian rainforests
c)
Mediterranean Basin
d)
Western Ghats
|
Ayush Choudhury answered |
Amzonian rain forests are called as lungs of forest because it contains different kinds of vegetation that purify the atmosphere of the earth.
If all the members of a host species die then all its unique parasites also die off, representing:- a)biological control
- b)co-extinction
- c)conservation
- d)extinction
Correct answer is option 'B'. Can you explain this answer?
If all the members of a host species die then all its unique parasites also die off, representing:
a)
biological control
b)
co-extinction
c)
conservation
d)
extinction
|
Diya Datta answered |
If all members fo a host species die the parasite that obtain their food from the particular host also die off due to lack of food. This represent co-existence of species.
Red data Book deals with:- a)Animals on verge of extinction
- b)Plants showing photoperiodism
- c)Endemic plant
- d)Plants that are extinct
Correct answer is option 'A'. Can you explain this answer?
Red data Book deals with:
a)
Animals on verge of extinction
b)
Plants showing photoperiodism
c)
Endemic plant
d)
Plants that are extinct
|
|
Rohit Shah answered |
Red Data Book is a state document established for documenting rare and endangered species of animals, plants and fungi, as well as some local subspecies (such as the Ladoga seal) that exist within the territory of the Russian Federation and its continental shelf and marine economic zone. The book has been adopted by Russia and all CIS states to enact a common agreement on rare and endangered species protection.
When we compare the relationship between species richness and area for wide variety of taxa, the graph appears to be a :- a)cubic parabola
- b)rectangular hyperbola
- c)cubic hyperbola
- d)rectangular parabola
Correct answer is option 'D'. Can you explain this answer?
When we compare the relationship between species richness and area for wide variety of taxa, the graph appears to be a :
a)
cubic parabola
b)
rectangular hyperbola
c)
cubic hyperbola
d)
rectangular parabola
|
Prasenjit Pillai answered |
When a graph is drawn to compare the relationship between species richness and area for wide variety of texa, the graph appears to be a rectangular hyperbola.
If we say, India has about 50,000 type of rice and 1000 types of varieties of mango what level of diversity it indicates:- a)community diversity
- b)ecosystem diversity
- c)genetic diversity
- d)species diversity
Correct answer is option 'C'. Can you explain this answer?
If we say, India has about 50,000 type of rice and 1000 types of varieties of mango what level of diversity it indicates:
a)
community diversity
b)
ecosystem diversity
c)
genetic diversity
d)
species diversity
|
Naveen Menon answered |
India has about 50,000 type of rice and 1000 types of varieties of mango. This thigh level of diversity indicates very high genetic diversity and one of the largest in the world.
Red data books are produced by:- a)IUCN
- b)WWF
- c)IBWL
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Red data books are produced by:
a)
IUCN
b)
WWF
c)
IBWL
d)
None of these
|
|
Devika Pillai answered |
Red data books are produced by IUCN, which stands for the International Union for Conservation of Nature. These books are a type of conservation tool used to identify and assess the conservation status of various species around the world.
The IUCN Red List of Threatened Species is the most well-known red data book produced by the organization. This list provides a comprehensive overview of the conservation status of tens of thousands of species, including mammals, birds, reptiles, fish, and plants.
The main purpose of red data books is to provide information on species that are at risk of extinction or are already extinct. This information can be used to inform conservation efforts, such as habitat preservation, captive breeding programs, and wildlife reintroduction programs.
Red data books typically include information on the following:
- The scientific name of the species
- The common name of the species
- The population size of the species
- The geographic range of the species
- The habitat of the species
- The reasons why the species is at risk of extinction
- The conservation measures that are being taken to protect the species
In addition to the IUCN Red List, other organizations also produce red data books that focus on specific regions or groups of species. For example, the European Red List is produced by the European Commission and includes information on the conservation status of European species.
Overall, red data books are an important conservation tool that helps to raise awareness about the plight of endangered species and inform conservation efforts around the world.
The IUCN Red List of Threatened Species is the most well-known red data book produced by the organization. This list provides a comprehensive overview of the conservation status of tens of thousands of species, including mammals, birds, reptiles, fish, and plants.
The main purpose of red data books is to provide information on species that are at risk of extinction or are already extinct. This information can be used to inform conservation efforts, such as habitat preservation, captive breeding programs, and wildlife reintroduction programs.
Red data books typically include information on the following:
- The scientific name of the species
- The common name of the species
- The population size of the species
- The geographic range of the species
- The habitat of the species
- The reasons why the species is at risk of extinction
- The conservation measures that are being taken to protect the species
In addition to the IUCN Red List, other organizations also produce red data books that focus on specific regions or groups of species. For example, the European Red List is produced by the European Commission and includes information on the conservation status of European species.
Overall, red data books are an important conservation tool that helps to raise awareness about the plight of endangered species and inform conservation efforts around the world.
When we will move away from the equator towards poles, we will find:- a)a gradual decrease in the species diversity
- b)a gradual increase in the ecosystem diversity
- c)a gradual increase in the species diversity
- d)no change in the species diversity
Correct answer is option 'A'. Can you explain this answer?
When we will move away from the equator towards poles, we will find:
a)
a gradual decrease in the species diversity
b)
a gradual increase in the ecosystem diversity
c)
a gradual increase in the species diversity
d)
no change in the species diversity
|
Krish Patel answered |
When we will move away from the equator towards poles there is a gradual decrease in the species diversity. This is because climatic condition becomes gradually adverse as we move from equator to poles.
In a wetland the primary factor controlling the environment and the associated plant and animal life will be:- a)water
- b)temperature
- c)soil
- d)light
Correct answer is option 'A'. Can you explain this answer?
In a wetland the primary factor controlling the environment and the associated plant and animal life will be:
a)
water
b)
temperature
c)
soil
d)
light
|
Akshat Chavan answered |
The area that is saturated with water is called wetland. In wetland the primary factor controlling the environment and the associated plant and animal life will be water.
Introducing exotic species into new areas will:
i) increase competition for food & space.
ii) introduce diseases
iii) improve habitat
iv) lead to extinction of native species- a)only iv is correct.
- b)only ii, iii & iv are correct.
- c)only i, ii & iv are correct.
- d)all the above are correct.
Correct answer is option 'C'. Can you explain this answer?
Introducing exotic species into new areas will:
i) increase competition for food & space.
ii) introduce diseases
iii) improve habitat
iv) lead to extinction of native species
i) increase competition for food & space.
ii) introduce diseases
iii) improve habitat
iv) lead to extinction of native species
a)
only iv is correct.
b)
only ii, iii & iv are correct.
c)
only i, ii & iv are correct.
d)
all the above are correct.
|
Geetika Shah answered |
The impacts of introducing a non-native or invasive species to an ecosystem will vary depending on a number of factors.
In some instances, the introduced species may not survive. If there is no ecological niche for the species to fill or the species cannot adapt to fill a different ecological niche, the species will likely go extinct relatively quickly at the local level.
However, if the species is a generalist, or a species able to thrive in a variety of environments and consume many food sources, that species will likely do well. If the ecosystem has reached its stable state, this means that the invasive species will have to replace a native species. No two species can share the same ecological niche, thus one will be better adapted and survive. If the invasive species is better adapted, it will out compete the native species.
If the species reproduces quickly, it is also more likely to thrive in a new ecosystem. If it can reproduce and grow faster than its competitor, it will eventually out compete that species.
Typically, invasive species harm an ecosystem. For example, the Burmese python is found in the US but it isn't supposed to be here. These snakes were likely released by humans and were pets at one time. The environment is suitable for them and they have adapted to the area.
Introducing a new species can also introduce any diseases that species has. These new diseases can spread to other native species and negatively affect them.
Introducing exotic species into new areas will increase competition for food and space. Sometimes, exotic species brings disease along with them. Exotic species in new area do not lead to extinction of native species.
What is the primary aim of bioprospecting?- a)To promote sustainable agriculture.
- b)To explore molecular and genetic diversity for economic benefits.
- c)To preserve the traditional knowledge of indigenous peoples.
- d)To breed new hybrid plant species.
Correct answer is option 'B'. Can you explain this answer?
a)
To promote sustainable agriculture.
b)
To explore molecular and genetic diversity for economic benefits.
c)
To preserve the traditional knowledge of indigenous peoples.
d)
To breed new hybrid plant species.
|
|
Dhruba Patel answered |
Understanding Bioprospecting
Bioprospecting is the process of exploring biodiversity for new resources that can be utilized for various human needs, particularly in pharmaceuticals, agriculture, and biotechnology. The primary aim of bioprospecting is encapsulated in option 'B':
Exploring Molecular and Genetic Diversity for Economic Benefits
Key Objectives of Bioprospecting:
Conclusion
In summary, the essence of bioprospecting lies in its capacity to harness the vast molecular and genetic diversity of life for economic gain, fostering innovation while promoting responsible stewardship of the planet's biodiversity. This makes it a crucial endeavor in the fields of science, medicine, and sustainable development.
Bioprospecting is the process of exploring biodiversity for new resources that can be utilized for various human needs, particularly in pharmaceuticals, agriculture, and biotechnology. The primary aim of bioprospecting is encapsulated in option 'B':
Exploring Molecular and Genetic Diversity for Economic Benefits
Key Objectives of Bioprospecting:
- Utilization of Natural Resources: Bioprospecting seeks to discover new biochemical compounds and genetic materials that can lead to innovative products, especially in medicine and agriculture.
- Economic Incentives: By tapping into the molecular and genetic diversity present in various organisms, bioprospecting aims to create economic opportunities through the development of new drugs, agricultural products, and industrial applications.
- Innovation in Biotechnology: The exploration of unique genetic traits can lead to breakthroughs in biotechnology, including the development of new crop varieties that are more resilient to pests and climate change.
- Conservation and Sustainability: Although primarily focused on economic benefits, bioprospecting encourages the sustainable use of biodiversity, ensuring that natural resources are not depleted in the process.
Conclusion
In summary, the essence of bioprospecting lies in its capacity to harness the vast molecular and genetic diversity of life for economic gain, fostering innovation while promoting responsible stewardship of the planet's biodiversity. This makes it a crucial endeavor in the fields of science, medicine, and sustainable development.
In a gene sanctuary genetic diversity of an endangered species can be preserved by :- a)protecting the ecosystem in which that species occurs naturally
- b)preserving DNA samples of different varieties in laboratory and growing them under controlled conditions.
- c)both A & B
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
In a gene sanctuary genetic diversity of an endangered species can be preserved by :
a)
protecting the ecosystem in which that species occurs naturally
b)
preserving DNA samples of different varieties in laboratory and growing them under controlled conditions.
c)
both A & B
d)
none of these
|
|
Krish Patel answered |
Conservation of genetic diversity under natural habitat of endangered species is called gene sanctuary.
What is the significance of the regression slope in the species-area relationship?- a)It represents the rate of species extinction.
- b)It indicates how species richness changes with increasing habitat area.
- c)It determines the biodiversity of tropical regions.
- d)It shows the diversity between plant and animal species.
Correct answer is option 'B'. Can you explain this answer?
a)
It represents the rate of species extinction.
b)
It indicates how species richness changes with increasing habitat area.
c)
It determines the biodiversity of tropical regions.
d)
It shows the diversity between plant and animal species.
|
Bs Academy answered |
The regression slope in the species-area relationship indicates how species richness increases with increasing habitat area. A steeper slope suggests a higher rate of species accumulation as area increases.
Which of the following is a function of pollinators in ecosystems?- a)To regulate the temperature of the environment.
- b)To control pest populations.
- c)To help in plant reproduction by pollinating flowers.
- d)To filter water and regulate its flow.
Correct answer is option 'C'. Can you explain this answer?
a)
To regulate the temperature of the environment.
b)
To control pest populations.
c)
To help in plant reproduction by pollinating flowers.
d)
To filter water and regulate its flow.
|
Soumya Basu answered |
Function of Pollinators in Ecosystems
Pollinators play a crucial role in maintaining healthy ecosystems, primarily through their contribution to plant reproduction.
Key Role in Plant Reproduction
- Pollination Process: Pollinators, such as bees, butterflies, birds, and bats, transfer pollen from the male parts of flowers (anthers) to the female parts (stigmas). This process is essential for fertilization and the production of seeds.
- Diversity of Plants: By enabling the reproduction of flowering plants, pollinators contribute significantly to biodiversity. Healthy populations of pollinators support a wide variety of plant species, which in turn sustain other organisms in the ecosystem.
- Food Production: Many crops and fruits depend on pollinators for their reproduction. Without them, the yield of essential food sources would drastically decline, impacting food security and human nutrition.
Impact on Ecosystem Health
- Habitat Creation: Pollinated plants provide habitats and food sources for various animals, insects, and microorganisms, playing a vital role in the overall health of ecosystems.
- Ecosystem Stability: A diverse range of plants contributes to ecosystem stability. Pollinators help ensure that various plants can reproduce, thus maintaining the balance of ecosystems.
In contrast, options such as regulating temperature, controlling pests, and filtering water are functions associated with other organisms and ecological processes. Thus, the correct answer is indeed option 'C', as pollinators are fundamental to facilitating plant reproduction, which is essential for sustaining ecosystems.
Pollinators play a crucial role in maintaining healthy ecosystems, primarily through their contribution to plant reproduction.
Key Role in Plant Reproduction
- Pollination Process: Pollinators, such as bees, butterflies, birds, and bats, transfer pollen from the male parts of flowers (anthers) to the female parts (stigmas). This process is essential for fertilization and the production of seeds.
- Diversity of Plants: By enabling the reproduction of flowering plants, pollinators contribute significantly to biodiversity. Healthy populations of pollinators support a wide variety of plant species, which in turn sustain other organisms in the ecosystem.
- Food Production: Many crops and fruits depend on pollinators for their reproduction. Without them, the yield of essential food sources would drastically decline, impacting food security and human nutrition.
Impact on Ecosystem Health
- Habitat Creation: Pollinated plants provide habitats and food sources for various animals, insects, and microorganisms, playing a vital role in the overall health of ecosystems.
- Ecosystem Stability: A diverse range of plants contributes to ecosystem stability. Pollinators help ensure that various plants can reproduce, thus maintaining the balance of ecosystems.
In contrast, options such as regulating temperature, controlling pests, and filtering water are functions associated with other organisms and ecological processes. Thus, the correct answer is indeed option 'C', as pollinators are fundamental to facilitating plant reproduction, which is essential for sustaining ecosystems.
Alexander Von Humbolt described for the first time - a)Species area relationships
- b)Population Growth equation
- c)Ecological Biodiversity
- d)Laws of limiting factor
Correct answer is option 'A'. Can you explain this answer?
Alexander Von Humbolt described for the first time
a)
Species area relationships
b)
Population Growth equation
c)
Ecological Biodiversity
d)
Laws of limiting factor
|
|
Hitakshi answered |
Species area relationship is the relationship between
the area and the particular habitat. It was first studied by Alexander Von Humbolt. He observed that within a region species richness increased with increasing explored area, but only up to a limit. It is dependent on immigration, extinction and clustering etc. So, the correct answer is option 'A'.
the area and the particular habitat. It was first studied by Alexander Von Humbolt. He observed that within a region species richness increased with increasing explored area, but only up to a limit. It is dependent on immigration, extinction and clustering etc. So, the correct answer is option 'A'.
Which of the following is NOT a major cause of species loss?- a)Habitat loss and fragmentation.
- b)Over-exploitation of resources.
- c)Biological invasions.
- d)Increased species-area relationship.
Correct answer is option 'D'. Can you explain this answer?
a)
Habitat loss and fragmentation.
b)
Over-exploitation of resources.
c)
Biological invasions.
d)
Increased species-area relationship.
|
|
Amar Mehra answered |
Understanding Species Loss
Species loss is a critical issue driven by several major factors. However, not all listed factors contribute equally to this decline. Let's explore the reasons behind the correct answer: option 'D'.
Major Causes of Species Loss
- Habitat Loss and Fragmentation:
This is the primary cause of species extinction. Human activities such as urban development, agriculture, and deforestation lead to the destruction and fragmentation of habitats. When ecosystems are disrupted, species lose their homes and resources, which can lead to population declines.
- Over-exploitation of Resources:
Overfishing, hunting, and harvesting of plants can deplete species faster than they can reproduce. Unsustainable practices result in the extinction of vulnerable species and disrupt ecological balance.
- Biological Invasions:
Non-native species can outcompete, prey on, or bring diseases to native species, leading to declines or extinctions. Invasive species can alter habitat conditions, making it difficult for local species to survive.
Species-Area Relationship
- Increased Species-Area Relationship:
This concept refers to the idea that larger areas typically support more species due to greater habitat diversity. While it is a useful ecological principle, it does not directly cause species loss. In fact, conserving larger areas can help preserve biodiversity by providing more habitat for various species.
Conclusion
In summary, options A, B, and C are significant contributors to species loss, while option D, the increased species-area relationship, is not a direct cause. Instead, it highlights the importance of habitat size in biodiversity conservation. Understanding these dynamics is crucial for effective conservation strategies.
Species loss is a critical issue driven by several major factors. However, not all listed factors contribute equally to this decline. Let's explore the reasons behind the correct answer: option 'D'.
Major Causes of Species Loss
- Habitat Loss and Fragmentation:
This is the primary cause of species extinction. Human activities such as urban development, agriculture, and deforestation lead to the destruction and fragmentation of habitats. When ecosystems are disrupted, species lose their homes and resources, which can lead to population declines.
- Over-exploitation of Resources:
Overfishing, hunting, and harvesting of plants can deplete species faster than they can reproduce. Unsustainable practices result in the extinction of vulnerable species and disrupt ecological balance.
- Biological Invasions:
Non-native species can outcompete, prey on, or bring diseases to native species, leading to declines or extinctions. Invasive species can alter habitat conditions, making it difficult for local species to survive.
Species-Area Relationship
- Increased Species-Area Relationship:
This concept refers to the idea that larger areas typically support more species due to greater habitat diversity. While it is a useful ecological principle, it does not directly cause species loss. In fact, conserving larger areas can help preserve biodiversity by providing more habitat for various species.
Conclusion
In summary, options A, B, and C are significant contributors to species loss, while option D, the increased species-area relationship, is not a direct cause. Instead, it highlights the importance of habitat size in biodiversity conservation. Understanding these dynamics is crucial for effective conservation strategies.
Which of the following is not correct according to analogy given by Paul Ehrlich?- a)Loss of the key species that drive the major ecosystem functions is a more serious threat to flight safety than loss of other less important species
- b)Proper functioning of ecosystem is initially may not be affected by species loss
- c)Over a period of time, if the species loss is continuous, the ecosystem gets affected after a time
- d)Even the loss of not much significant species lead to critical damage to ecosystem
Correct answer is option 'D'. Can you explain this answer?
a)
Loss of the key species that drive the major ecosystem functions is a more serious threat to flight safety than loss of other less important species
b)
Proper functioning of ecosystem is initially may not be affected by species loss
c)
Over a period of time, if the species loss is continuous, the ecosystem gets affected after a time
d)
Even the loss of not much significant species lead to critical damage to ecosystem
|
|
Navya Choudhury answered |
Understanding Paul Ehrlich's Analogy
Paul Ehrlich's analogy highlights the importance of species in ecosystems and their functionalities. Let's break down the provided options and clarify why option 'D' is considered incorrect.
Key Species vs. Less Important Species
- Option (a) states that the loss of key species, which drive major ecosystem functions, poses a greater threat to ecosystem stability than the loss of less important species. This is accurate; key species often play critical roles (e.g., pollinators, top predators) that maintain ecological balance.
Initial Ecosystem Resilience
- Option (b) suggests that the proper functioning of an ecosystem may initially remain unaffected by species loss. This is also valid; ecosystems can often absorb some level of species loss without immediate impact, showcasing resilience.
Long-Term Effects of Continuous Species Loss
- Option (c) emphasizes that continuous species loss will eventually impact ecosystem health over time. This is correct, as prolonged loss can disrupt food webs and ecological processes.
Misconception of Insignificant Species
- Option (d) claims that even the loss of not very significant species can lead to critical damage to ecosystems. This statement is misleading. While all species contribute to ecosystem dynamics, not all species have equal impact. Some species may be redundant and their loss may not result in immediate critical damage.
Conclusion
In conclusion, option 'D' is considered incorrect because it overemphasizes the significance of lesser species in causing critical damage to ecosystems. The reality is that while biodiversity is crucial, not all species hold equal weight in maintaining ecosystem stability.
Paul Ehrlich's analogy highlights the importance of species in ecosystems and their functionalities. Let's break down the provided options and clarify why option 'D' is considered incorrect.
Key Species vs. Less Important Species
- Option (a) states that the loss of key species, which drive major ecosystem functions, poses a greater threat to ecosystem stability than the loss of less important species. This is accurate; key species often play critical roles (e.g., pollinators, top predators) that maintain ecological balance.
Initial Ecosystem Resilience
- Option (b) suggests that the proper functioning of an ecosystem may initially remain unaffected by species loss. This is also valid; ecosystems can often absorb some level of species loss without immediate impact, showcasing resilience.
Long-Term Effects of Continuous Species Loss
- Option (c) emphasizes that continuous species loss will eventually impact ecosystem health over time. This is correct, as prolonged loss can disrupt food webs and ecological processes.
Misconception of Insignificant Species
- Option (d) claims that even the loss of not very significant species can lead to critical damage to ecosystems. This statement is misleading. While all species contribute to ecosystem dynamics, not all species have equal impact. Some species may be redundant and their loss may not result in immediate critical damage.
Conclusion
In conclusion, option 'D' is considered incorrect because it overemphasizes the significance of lesser species in causing critical damage to ecosystems. The reality is that while biodiversity is crucial, not all species hold equal weight in maintaining ecosystem stability.
How many species in the world are facing threat of extinction?- a)More than 50,500.
- b)Less than 1,550
- c)More than 15,500.
- d)No more species are endangered.
Correct answer is option 'C'. Can you explain this answer?
How many species in the world are facing threat of extinction?
a)
More than 50,500.
b)
Less than 1,550
c)
More than 15,500.
d)
No more species are endangered.
|
|
Ayush Choudhury answered |
More than 15,500 species worldwide is facing threat of extinction which includes amphibians, gymnosperms, reptiles, birds and mammals etc.
Rare species are :
i. represented by small populations in the world.
ii. thinly distributed over a wide area.
iii. all are grouped as endangered or vulnerable at present. - a)only i & ii are correct.
- b)only i & iii are correct.
- c)only ii & iii are correct.
- d)all are correct.
Correct answer is option 'A'. Can you explain this answer?
Rare species are :
i. represented by small populations in the world.
ii. thinly distributed over a wide area.
iii. all are grouped as endangered or vulnerable at present.
i. represented by small populations in the world.
ii. thinly distributed over a wide area.
iii. all are grouped as endangered or vulnerable at present.
a)
only i & ii are correct.
b)
only i & iii are correct.
c)
only ii & iii are correct.
d)
all are correct.
|
Shruti Chauhan answered |
Rare species are represented by small populations in the world. They are thinly distributed over wide area. Hence both statements are correct.
How many species of plants contribute to the traditional medicines used by native peoples around the world?- a)2,500
- b)2,000
- c)25,000
- d)5,000
Correct answer is option 'C'. Can you explain this answer?
How many species of plants contribute to the traditional medicines used by native peoples around the world?
a)
2,500
b)
2,000
c)
25,000
d)
5,000
|
EduRev NEET answered |
- The species of plants contribute to the traditional medicines used by native peoples around the world are approximately 25,000.
- Some examples of traditional plants used for medicinal purposes are ginger, garlic, chamomile, tulsi, etc.
To preserve seeds that rapidly lose viability, can’t survive dessication and plants which are propagated vegetatively, method employed is :- a)cryopreservation
- b)agroforestry
- c)gene sanctuary
- d)in - situ conservation
Correct answer is option 'A'. Can you explain this answer?
To preserve seeds that rapidly lose viability, can’t survive dessication and plants which are propagated vegetatively, method employed is :
a)
cryopreservation
b)
agroforestry
c)
gene sanctuary
d)
in - situ conservation
|
|
Ayush Choudhury answered |
Cryopreservation is the method of preserving living organisms or their parts at extremely low temperature. To preserve seeds that rapidly lose viability and cannot survive desiccation are preserved by this method.
Which of the two groups have the same diversity in Amazonian Rain forest?- a)Amphibians and Mammals
- b)Amphibians and Reptiles
- c)Reptiles and Mammals
- d)Reptiles and Birds
Correct answer is option 'A'. Can you explain this answer?
Which of the two groups have the same diversity in Amazonian Rain forest?
a)
Amphibians and Mammals
b)
Amphibians and Reptiles
c)
Reptiles and Mammals
d)
Reptiles and Birds
|
Mohit Rajpoot answered |
The largely tropical Amazonian rain forest in South America has the greatest biodiversity on earth- it is home to more than 40,000 species of plants, 3,000 of fishes, 1,300 of birds, 427 of mammals, 427 of amphibians, 378 of reptiles and of more than 1,25,000 invertebrates.
Topic in NCERT: Biodiversity and conservation
Line in NCERT: "the largely tropical amazonian rain forest in south america has the greatest biodiversity on earth- it is home to more than 40,000 species of plants, 3,000 of fishes, 1,300 of birds, 427 of mammals, 427 of amphibians, 378 of reptiles and of more than 1,25,000 invertebrates."
According to the concept of species area relations:- a)The number of species in an area increases with the size of the area
- b)Larger species require larger habitat areas than do smaller species
- c)Most species within any given area are endemic
- d)The larger the area, the greater the extinction rate
Correct answer is option 'A'. Can you explain this answer?
a)
The number of species in an area increases with the size of the area
b)
Larger species require larger habitat areas than do smaller species
c)
Most species within any given area are endemic
d)
The larger the area, the greater the extinction rate
|
Ciel Knowledge answered |
The species-area relationship states that the number of species (species richness) increases with the size of the area, typically following a power-law relationship (Option A is correct). Option B is a general ecological principle but not a core part of the species-area relationship. Option C is incorrect, as endemism depends on geographic isolation, not area size. Option D is incorrect, as larger areas typically have lower extinction rates due to greater habitat stability and population sizes. Thus, Option A is the most accurate.
Topic in NCERT: Species-area relationships
Line in NCERT: "species richness increased with increasing explored area, but only up to a limit."
What is the protection and conservation of species outside their natural habitat called?- a)No conservation
- b)On-site conservation
- c)Ex-situ conservation
- d)In-situ conservation
Correct answer is option 'C'. Can you explain this answer?
What is the protection and conservation of species outside their natural habitat called?
a)
No conservation
b)
On-site conservation
c)
Ex-situ conservation
d)
In-situ conservation
|
Infinity Academy answered |
The off-site or the protection and conservation of species (genetic resources) outside their natural habitat (populations of plant or animal species) is known as ex-situ conservation. Areas such as botanical gardens, zoos, Gene banks, Tissue culture banks are the places were ex-situ conservation is done.
Loss of biodiversity may lead to all except:- a)decline in plant production
- b)increased resistance to environmental perturbance
- c)increased variability in water use
- d)increased variability in pest and disease cycle
Correct answer is option 'B'. Can you explain this answer?
Loss of biodiversity may lead to all except:
a)
decline in plant production
b)
increased resistance to environmental perturbance
c)
increased variability in water use
d)
increased variability in pest and disease cycle
|
Pritam Choudhary answered |
Understanding Biodiversity Loss
Loss of biodiversity refers to the decline in the variety of life on Earth, which can have significant ecological consequences. The effects of such loss can be profound, impacting ecosystems and human life alike.
Consequences of Biodiversity Loss
- Decline in Plant Production: A decrease in biodiversity can lead to lower plant productivity. Diverse ecosystems are more resilient and productive because they utilize resources more efficiently.
- Increased Variability in Water Use: Biodiversity contributes to the regulation of water cycles. A loss of species can lead to unpredictable changes in water availability and quality, affecting agriculture and drinking water sources.
- Increased Variability in Pest and Disease Cycles: Reduced biodiversity often results in an increase in pest and disease outbreaks. When natural predators or resistant plant varieties diminish, pests can thrive, leading to crop failures and health issues.
Why Increased Resistance is Incorrect
- Increased Resistance to Environmental Perturbance: This statement is incorrect because loss of biodiversity typically reduces an ecosystem's resilience. Diverse ecosystems have various species that can adapt to changes, providing stability and resistance to environmental stressors. When biodiversity declines, ecosystems become more vulnerable to disturbances like climate change, habitat loss, and pollution.
Conclusion
In summary, the correct answer is option 'B' because biodiversity loss does not lead to increased resistance; rather, it diminishes an ecosystem's ability to cope with environmental changes. Understanding these relationships is crucial for conservation efforts and maintaining ecological balance.
Loss of biodiversity refers to the decline in the variety of life on Earth, which can have significant ecological consequences. The effects of such loss can be profound, impacting ecosystems and human life alike.
Consequences of Biodiversity Loss
- Decline in Plant Production: A decrease in biodiversity can lead to lower plant productivity. Diverse ecosystems are more resilient and productive because they utilize resources more efficiently.
- Increased Variability in Water Use: Biodiversity contributes to the regulation of water cycles. A loss of species can lead to unpredictable changes in water availability and quality, affecting agriculture and drinking water sources.
- Increased Variability in Pest and Disease Cycles: Reduced biodiversity often results in an increase in pest and disease outbreaks. When natural predators or resistant plant varieties diminish, pests can thrive, leading to crop failures and health issues.
Why Increased Resistance is Incorrect
- Increased Resistance to Environmental Perturbance: This statement is incorrect because loss of biodiversity typically reduces an ecosystem's resilience. Diverse ecosystems have various species that can adapt to changes, providing stability and resistance to environmental stressors. When biodiversity declines, ecosystems become more vulnerable to disturbances like climate change, habitat loss, and pollution.
Conclusion
In summary, the correct answer is option 'B' because biodiversity loss does not lead to increased resistance; rather, it diminishes an ecosystem's ability to cope with environmental changes. Understanding these relationships is crucial for conservation efforts and maintaining ecological balance.
How many hotspots of biodiversity in the world have been identified till date by Norman Myers?- a)34
- b)17
- c)25
- d)43
Correct answer is option 'A'. Can you explain this answer?
How many hotspots of biodiversity in the world have been identified till date by Norman Myers?
a)
34
b)
17
c)
25
d)
43
|
|
Hitakshi answered |
Biodiversity hotspots are a method to identify those regions of the world where attention is needed to address biodiversity loss and to guide investments in conservation. The idea was first developed by Norman Myers in 1988 to identify tropical forests hotspots characterised both by exceptional levels of plant endemism and serious habitat loss which he then expanded to a more global scope. A total of 34 hotspots in the world has been identified till date by Norman Myers, that cover only 2.3% of earth surface but are habitat for 77% of world's species.
Which one of the following have the highest number of species in nature?- a)Insects
- b)Birds
- c)Angiosperms
- d)Fungi
Correct answer is option 'A'. Can you explain this answer?
Which one of the following have the highest number of species in nature?
a)
Insects
b)
Birds
c)
Angiosperms
d)
Fungi
|
Persia Harris answered |
Insects have a powerful sense that could lead to something very dangerous and lead that person into a serious situation which meaning it’s has the highest number of species in the nature that we live in and on the planet we shall survive on! The answer would A!
The organisms that has been completely eliminated or died out from earth are called?- a)Extinct organisms
- b)Endangered species
- c)Critically endangered
- d)Vulnerable species
Correct answer is option 'A'. Can you explain this answer?
The organisms that has been completely eliminated or died out from earth are called?
a)
Extinct organisms
b)
Endangered species
c)
Critically endangered
d)
Vulnerable species
|
|
Ayush Choudhury answered |
The organisms that has been completely eliminated or died out from earth are called extinct organisms. For example Dodo.
Which of the following statement is/are correct?
a. As we move on Earth from low to high latitude, the biodiversity increases.
b. In rivet popper hypothesis given by Paul Ehrlich, rivets on the wings are considered as key species.
c. India possesses 8.1% species diversity of the world.- a)b and c only
- b)b only
- c)All a, b and c
- d)a and c only
Correct answer is option 'A'. Can you explain this answer?
Which of the following statement is/are correct?
a. As we move on Earth from low to high latitude, the biodiversity increases.
b. In rivet popper hypothesis given by Paul Ehrlich, rivets on the wings are considered as key species.
c. India possesses 8.1% species diversity of the world.
a. As we move on Earth from low to high latitude, the biodiversity increases.
b. In rivet popper hypothesis given by Paul Ehrlich, rivets on the wings are considered as key species.
c. India possesses 8.1% species diversity of the world.
a)
b and c only
b)
b only
c)
All a, b and c
d)
a and c only
|
|
Navya Choudhury answered |
Understanding Biodiversity and the Correct Statements
The question presents three statements regarding biodiversity, and the correct answer is option 'A', which states that both statements b and c are correct. Let's explore each statement:
Statement A: Biodiversity and Latitude
- Biodiversity generally decreases as one moves from the equator towards the poles.
- Tropical regions at low latitudes are rich in species diversity, while higher latitudes tend to have fewer species.
- Therefore, statement A is incorrect.
Statement B: Rivet Popper Hypothesis
- The rivet popper hypothesis, proposed by Paul Ehrlich, uses the metaphor of rivets on an airplane wing to illustrate the importance of biodiversity.
- In this analogy, each rivet represents a species; losing species (or rivets) can lead to the failure of the ecosystem (or airplane).
- The key species in this analogy are not referred to as "rivets on the wings," making statement B incorrect.
Statement C: Species Diversity in India
- India is recognized as a biodiversity hotspot, containing approximately 8.1% of the world's species diversity.
- This statistic reflects the rich variety of flora and fauna in the country, making statement C correct.
Conclusion
- Therefore, the correct answer should highlight that statement C is correct, while statement A and B are incorrect.
- As per the question's assertion, the answer should be 'd' (a and c only) if it were accurate, but given the context, it's clear that the understanding of the statements needs clarification.
In summary, while the correct answer provided is option 'A', it should be noted that the statements regarding biodiversity and the rivet popper hypothesis need to be carefully evaluated for accuracy.
The question presents three statements regarding biodiversity, and the correct answer is option 'A', which states that both statements b and c are correct. Let's explore each statement:
Statement A: Biodiversity and Latitude
- Biodiversity generally decreases as one moves from the equator towards the poles.
- Tropical regions at low latitudes are rich in species diversity, while higher latitudes tend to have fewer species.
- Therefore, statement A is incorrect.
Statement B: Rivet Popper Hypothesis
- The rivet popper hypothesis, proposed by Paul Ehrlich, uses the metaphor of rivets on an airplane wing to illustrate the importance of biodiversity.
- In this analogy, each rivet represents a species; losing species (or rivets) can lead to the failure of the ecosystem (or airplane).
- The key species in this analogy are not referred to as "rivets on the wings," making statement B incorrect.
Statement C: Species Diversity in India
- India is recognized as a biodiversity hotspot, containing approximately 8.1% of the world's species diversity.
- This statistic reflects the rich variety of flora and fauna in the country, making statement C correct.
Conclusion
- Therefore, the correct answer should highlight that statement C is correct, while statement A and B are incorrect.
- As per the question's assertion, the answer should be 'd' (a and c only) if it were accurate, but given the context, it's clear that the understanding of the statements needs clarification.
In summary, while the correct answer provided is option 'A', it should be noted that the statements regarding biodiversity and the rivet popper hypothesis need to be carefully evaluated for accuracy.
Which of the statements given above is/are correct regarding alien species invasions and co-extinctions?i. The introduction of the Nile perch in Lake Victoria caused the decline of indigenous cichlid fish species.ii. Invasive weed species such as Lantana and water hyacinth do not pose a significant threat to native species.iii. Co-extinctions occur when a species extinction leads to the extinction of its associated mutualistic partners.iv. The African catfish Clarias gariepinus has been legally introduced into rivers for aquaculture purposes.- a)A: i and iii
- b)B: i, ii, and iv
- c)C: ii and iv
- d)D: i, iii, and iv
Correct answer is option 'A'. Can you explain this answer?
Which of the statements given above is/are correct regarding alien species invasions and co-extinctions?
i. The introduction of the Nile perch in Lake Victoria caused the decline of indigenous cichlid fish species.
ii. Invasive weed species such as Lantana and water hyacinth do not pose a significant threat to native species.
iii. Co-extinctions occur when a species extinction leads to the extinction of its associated mutualistic partners.
iv. The African catfish Clarias gariepinus has been legally introduced into rivers for aquaculture purposes.
a)
A: i and iii
b)
B: i, ii, and iv
c)
C: ii and iv
d)
D: i, iii, and iv
|
Rutuja Datta answered |
Understanding Alien Species Invasions and Co-extinctions
Alien species invasions and co-extinctions are critical ecological issues impacting biodiversity. Let's analyze the statements provided:
Statement i: Nile Perch in Lake Victoria
- The introduction of Nile perch has indeed caused significant declines in indigenous cichlid fish species. This is a well-documented case of how an invasive species can disrupt local ecosystems and lead to the extinction of native species.
Statement ii: Invasive Weed Species
- This statement is incorrect. Invasive species like Lantana and water hyacinth pose substantial threats to native species by outcompeting them for resources, altering habitats, and disrupting local ecosystems. They can lead to the decline or extinction of native flora and fauna.
Statement iii: Co-extinctions
- Co-extinctions occur when the extinction of one species leads to the extinction of another that relies on it for survival, often seen in mutualistic relationships. This statement is correct, as the loss of a species can have cascading effects on its ecological partners.
Statement iv: African Catfish Introduction
- The African catfish (Clarias gariepinus) has been legally introduced into rivers in various regions for aquaculture. This statement is accurate and reflects the practice of using certain fish species to enhance aquaculture productivity.
Conclusion
- Based on the analysis, statements i, iii, and iv are correct, while statement ii is false. Therefore, the correct answer is option 'A': i and iii.
Understanding these dynamics is crucial for conservation efforts and managing biodiversity effectively.
Alien species invasions and co-extinctions are critical ecological issues impacting biodiversity. Let's analyze the statements provided:
Statement i: Nile Perch in Lake Victoria
- The introduction of Nile perch has indeed caused significant declines in indigenous cichlid fish species. This is a well-documented case of how an invasive species can disrupt local ecosystems and lead to the extinction of native species.
Statement ii: Invasive Weed Species
- This statement is incorrect. Invasive species like Lantana and water hyacinth pose substantial threats to native species by outcompeting them for resources, altering habitats, and disrupting local ecosystems. They can lead to the decline or extinction of native flora and fauna.
Statement iii: Co-extinctions
- Co-extinctions occur when the extinction of one species leads to the extinction of another that relies on it for survival, often seen in mutualistic relationships. This statement is correct, as the loss of a species can have cascading effects on its ecological partners.
Statement iv: African Catfish Introduction
- The African catfish (Clarias gariepinus) has been legally introduced into rivers in various regions for aquaculture. This statement is accurate and reflects the practice of using certain fish species to enhance aquaculture productivity.
Conclusion
- Based on the analysis, statements i, iii, and iv are correct, while statement ii is false. Therefore, the correct answer is option 'A': i and iii.
Understanding these dynamics is crucial for conservation efforts and managing biodiversity effectively.
What are the species called whose number of individuals is greatly reduced to a critical level?- a)Indeterminate
- b)Endangered
- c)Vulnerable
- d)Rare
Correct answer is option 'B'. Can you explain this answer?
What are the species called whose number of individuals is greatly reduced to a critical level?
a)
Indeterminate
b)
Endangered
c)
Vulnerable
d)
Rare
|
Saranya Joshi answered |
Endangered Species
Endangered species refer to the species whose number of individuals is greatly reduced to a critical level. These species are at risk of extinction in the near future if appropriate measures are not taken to protect and conserve them. The term "endangered" is used to describe the level of threat a species faces based on its population size and the potential risks it encounters in its natural habitat.
Reasons for Endangerment
There are several factors that can contribute to a species becoming endangered. Some of the key reasons include:
1. Habitat loss: The destruction, degradation, or fragmentation of natural habitats due to human activities such as deforestation, urbanization, and agriculture can eliminate or disrupt the habitats of many species.
2. Climate change: Alterations in temperature, precipitation patterns, and sea levels caused by climate change can negatively impact ecosystems and the species that rely on them.
3. Pollution: Pollution from various sources, such as industrial waste, agricultural runoff, and air pollution, can contaminate habitats, water bodies, and food sources, leading to the decline of species.
4. Overexploitation: Unsustainable hunting, fishing, and harvesting practices can deplete populations of certain species, pushing them towards endangerment.
5. Invasive species: The introduction of non-native species into ecosystems can disrupt the balance of the ecosystem and outcompete native species for resources, leading to the decline of the latter.
6. Disease and predation: Outbreaks of diseases or the presence of predators can have a significant impact on the population size of certain species, especially if they lack natural defenses or immunity.
Conservation Efforts
To prevent the extinction of endangered species, various conservation efforts are undertaken. These include:
1. Habitat protection: Establishing protected areas, national parks, and wildlife reserves to safeguard the habitats of endangered species from human encroachment and destructive activities.
2. Species reintroduction: Captive breeding programs and reintroduction initiatives help increase the population size of endangered species and reintroduce them into their natural habitats.
3. Conservation education: Raising awareness among the public about the importance of biodiversity, conservation, and sustainable practices helps garner support and promote responsible behavior towards endangered species and their habitats.
4. International agreements and legislation: Governments and organizations work together to develop and implement laws, regulations, and international agreements that protect endangered species and regulate activities that pose a threat to them.
5. Research and monitoring: Conducting scientific research, monitoring population trends, and assessing the threats faced by endangered species help in developing effective conservation strategies and management plans.
By implementing these conservation initiatives, it is possible to mitigate the risks faced by endangered species and work towards their recovery and long-term survival.
Endangered species refer to the species whose number of individuals is greatly reduced to a critical level. These species are at risk of extinction in the near future if appropriate measures are not taken to protect and conserve them. The term "endangered" is used to describe the level of threat a species faces based on its population size and the potential risks it encounters in its natural habitat.
Reasons for Endangerment
There are several factors that can contribute to a species becoming endangered. Some of the key reasons include:
1. Habitat loss: The destruction, degradation, or fragmentation of natural habitats due to human activities such as deforestation, urbanization, and agriculture can eliminate or disrupt the habitats of many species.
2. Climate change: Alterations in temperature, precipitation patterns, and sea levels caused by climate change can negatively impact ecosystems and the species that rely on them.
3. Pollution: Pollution from various sources, such as industrial waste, agricultural runoff, and air pollution, can contaminate habitats, water bodies, and food sources, leading to the decline of species.
4. Overexploitation: Unsustainable hunting, fishing, and harvesting practices can deplete populations of certain species, pushing them towards endangerment.
5. Invasive species: The introduction of non-native species into ecosystems can disrupt the balance of the ecosystem and outcompete native species for resources, leading to the decline of the latter.
6. Disease and predation: Outbreaks of diseases or the presence of predators can have a significant impact on the population size of certain species, especially if they lack natural defenses or immunity.
Conservation Efforts
To prevent the extinction of endangered species, various conservation efforts are undertaken. These include:
1. Habitat protection: Establishing protected areas, national parks, and wildlife reserves to safeguard the habitats of endangered species from human encroachment and destructive activities.
2. Species reintroduction: Captive breeding programs and reintroduction initiatives help increase the population size of endangered species and reintroduce them into their natural habitats.
3. Conservation education: Raising awareness among the public about the importance of biodiversity, conservation, and sustainable practices helps garner support and promote responsible behavior towards endangered species and their habitats.
4. International agreements and legislation: Governments and organizations work together to develop and implement laws, regulations, and international agreements that protect endangered species and regulate activities that pose a threat to them.
5. Research and monitoring: Conducting scientific research, monitoring population trends, and assessing the threats faced by endangered species help in developing effective conservation strategies and management plans.
By implementing these conservation initiatives, it is possible to mitigate the risks faced by endangered species and work towards their recovery and long-term survival.
Which of the following statements regarding the diversity of plants and animals in tropical regions is/are correct?i. Species diversity is generally higher in tropical regions compared to temperate and polar areas due to longer evolutionary timeframes.ii. Tropical environments, being less seasonal and more constant, promote niche specialization which contributes to greater species diversity.iii. The greater availability of solar energy in tropical regions leads to higher productivity, which indirectly supports greater biodiversity.iv. Polar regions have been less affected by glaciation events than tropical regions, resulting in higher species diversity in the poles.- a) i, ii, and iii
- b) i and iv
- c) ii and iii
- d) i, ii, iii, and iv
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements regarding the diversity of plants and animals in tropical regions is/are correct?
i. Species diversity is generally higher in tropical regions compared to temperate and polar areas due to longer evolutionary timeframes.
ii. Tropical environments, being less seasonal and more constant, promote niche specialization which contributes to greater species diversity.
iii. The greater availability of solar energy in tropical regions leads to higher productivity, which indirectly supports greater biodiversity.
iv. Polar regions have been less affected by glaciation events than tropical regions, resulting in higher species diversity in the poles.
a)
i, ii, and iii
b)
i and iv
c)
ii and iii
d)
i, ii, iii, and iv
|
|
Rutuja Datta answered |
Understanding Species Diversity in Tropical Regions
The statements regarding the diversity of plants and animals in tropical regions have varying degrees of accuracy. Here's a detailed explanation of why options i, ii, and iii are correct, while iv is inaccurate.
i. Longer Evolutionary Timeframes
- Species diversity is indeed higher in tropical regions compared to temperate and polar areas.
- This is primarily because tropical regions have experienced fewer severe climate changes over time, allowing species to evolve and diversify more extensively.
ii. Niche Specialization
- Tropical environments are characterized by less seasonal variation.
- This stability promotes niche specialization, where species adapt to specific roles or habitats, leading to greater species diversity.
iii. Higher Solar Energy Availability
- Tropical regions receive more solar energy, which enhances productivity.
- Increased plant growth supports a larger and more diverse array of animal species, contributing to higher biodiversity.
iv. Misconception about Polar Regions
- Polar regions have been significantly affected by glaciation events, leading to lower species diversity.
- In contrast, tropical regions have maintained a more stable climate, fostering a rich variety of life forms.
Conclusion
So, the correct answer is option 'A' (i, ii, and iii) as these statements accurately reflect the reasons behind the higher biodiversity in tropical regions, while option iv is incorrect.
The statements regarding the diversity of plants and animals in tropical regions have varying degrees of accuracy. Here's a detailed explanation of why options i, ii, and iii are correct, while iv is inaccurate.
i. Longer Evolutionary Timeframes
- Species diversity is indeed higher in tropical regions compared to temperate and polar areas.
- This is primarily because tropical regions have experienced fewer severe climate changes over time, allowing species to evolve and diversify more extensively.
ii. Niche Specialization
- Tropical environments are characterized by less seasonal variation.
- This stability promotes niche specialization, where species adapt to specific roles or habitats, leading to greater species diversity.
iii. Higher Solar Energy Availability
- Tropical regions receive more solar energy, which enhances productivity.
- Increased plant growth supports a larger and more diverse array of animal species, contributing to higher biodiversity.
iv. Misconception about Polar Regions
- Polar regions have been significantly affected by glaciation events, leading to lower species diversity.
- In contrast, tropical regions have maintained a more stable climate, fostering a rich variety of life forms.
Conclusion
So, the correct answer is option 'A' (i, ii, and iii) as these statements accurately reflect the reasons behind the higher biodiversity in tropical regions, while option iv is incorrect.
Which of the statements given above is/are correct?i. India accounts for 8.1% of global species diversity despite covering only 2.4% of the world's land area.ii. Approximately 45,000 plant species have been documented in India, along with twice as many animal species.iii. According to global estimates, only 22% of all living species have been identified so far.iv. It is estimated that there are less than 100,000 undiscovered plant species in India.- a) i, ii and iii
- b) ii and iii
- c) i, ii, iii and iv
- d) i and iv
Correct answer is option 'A'. Can you explain this answer?
Which of the statements given above is/are correct?
i. India accounts for 8.1% of global species diversity despite covering only 2.4% of the world's land area.
ii. Approximately 45,000 plant species have been documented in India, along with twice as many animal species.
iii. According to global estimates, only 22% of all living species have been identified so far.
iv. It is estimated that there are less than 100,000 undiscovered plant species in India.
a)
i, ii and iii
b)
ii and iii
c)
i, ii, iii and iv
d)
i and iv
|
|
Rutuja Datta answered |
India's Species Diversity
India is renowned for its rich biodiversity, and the statements provided reflect various aspects of this diversity. Let's break down each statement to understand why options (i), (ii), and (iii) are correct.
Statement Analysis
- i. India accounts for 8.1% of global species diversity despite covering only 2.4% of the world's land area.
- This statement is accurate. India is one of the 17 megadiverse countries, hosting a significant percentage of the world’s total species despite its relatively small land area.
- ii. Approximately 45,000 plant species have been documented in India, along with twice as many animal species.
- This statement is also correct. India boasts a diverse range of flora and fauna, with approximately 45,000 documented plant species and an estimated 91,000 animal species, highlighting its ecological richness.
- iii. According to global estimates, only 22% of all living species have been identified so far.
- This statement holds true as well. Global biodiversity studies indicate that a significant number of species remain undiscovered, emphasizing the ongoing need for research in biodiversity.
- iv. It is estimated that there are less than 100,000 undiscovered plant species in India.
- This statement is less accurate. Estimates suggest that there could be more undiscovered species, potentially exceeding 100,000, indicating that the actual number of undiscovered species could be higher than stated.
Conclusion
Based on this analysis, the correct answer is option A: i, ii, and iii are correct statements about biodiversity in India.
India is renowned for its rich biodiversity, and the statements provided reflect various aspects of this diversity. Let's break down each statement to understand why options (i), (ii), and (iii) are correct.
Statement Analysis
- i. India accounts for 8.1% of global species diversity despite covering only 2.4% of the world's land area.
- This statement is accurate. India is one of the 17 megadiverse countries, hosting a significant percentage of the world’s total species despite its relatively small land area.
- ii. Approximately 45,000 plant species have been documented in India, along with twice as many animal species.
- This statement is also correct. India boasts a diverse range of flora and fauna, with approximately 45,000 documented plant species and an estimated 91,000 animal species, highlighting its ecological richness.
- iii. According to global estimates, only 22% of all living species have been identified so far.
- This statement holds true as well. Global biodiversity studies indicate that a significant number of species remain undiscovered, emphasizing the ongoing need for research in biodiversity.
- iv. It is estimated that there are less than 100,000 undiscovered plant species in India.
- This statement is less accurate. Estimates suggest that there could be more undiscovered species, potentially exceeding 100,000, indicating that the actual number of undiscovered species could be higher than stated.
Conclusion
Based on this analysis, the correct answer is option A: i, ii, and iii are correct statements about biodiversity in India.
What is the correct full form of IUCN?- a)International Union for Conservation of Nuts
- b)International Union for Conservation of Natural habitat
- c)International Union for Conservation of Nature
- d)International Union for Conservation of Numbers
Correct answer is option 'C'. Can you explain this answer?
What is the correct full form of IUCN?
a)
International Union for Conservation of Nuts
b)
International Union for Conservation of Natural habitat
c)
International Union for Conservation of Nature
d)
International Union for Conservation of Numbers
|
|
Ayush Saini answered |
International Union for Conservation of Nature (IUCN)
The correct full form of IUCN is the International Union for Conservation of Nature. It is an international organization working in the field of nature conservation and sustainable use of natural resources. Here is a detailed explanation of the organization:
History
- IUCN was established in 1948 and has its headquarters in Switzerland.
- It is the world's oldest and largest global environmental organization.
Mission
- The mission of IUCN is to influence, encourage, and assist societies worldwide to conserve the integrity and diversity of nature and to ensure that any use of natural resources is equitable and ecologically sustainable.
Functions
- IUCN assesses the conservation status of species, habitats, and ecosystems.
- It provides data and analysis to support conservation efforts.
- The organization also works on the ground to implement conservation projects and initiatives.
Red List
- IUCN is known for its Red List of Threatened Species, which assesses the conservation status of different species worldwide.
- The Red List is a critical tool for conservationists, policymakers, and researchers to prioritize conservation efforts.
Members
- IUCN has over 1,400 member organizations, including government agencies, NGOs, and indigenous peoples' organizations.
- The organization has a diverse and global network of members working towards nature conservation.
In conclusion, the International Union for Conservation of Nature (IUCN) plays a crucial role in promoting nature conservation and sustainable use of natural resources worldwide.
The correct full form of IUCN is the International Union for Conservation of Nature. It is an international organization working in the field of nature conservation and sustainable use of natural resources. Here is a detailed explanation of the organization:
History
- IUCN was established in 1948 and has its headquarters in Switzerland.
- It is the world's oldest and largest global environmental organization.
Mission
- The mission of IUCN is to influence, encourage, and assist societies worldwide to conserve the integrity and diversity of nature and to ensure that any use of natural resources is equitable and ecologically sustainable.
Functions
- IUCN assesses the conservation status of species, habitats, and ecosystems.
- It provides data and analysis to support conservation efforts.
- The organization also works on the ground to implement conservation projects and initiatives.
Red List
- IUCN is known for its Red List of Threatened Species, which assesses the conservation status of different species worldwide.
- The Red List is a critical tool for conservationists, policymakers, and researchers to prioritize conservation efforts.
Members
- IUCN has over 1,400 member organizations, including government agencies, NGOs, and indigenous peoples' organizations.
- The organization has a diverse and global network of members working towards nature conservation.
In conclusion, the International Union for Conservation of Nature (IUCN) plays a crucial role in promoting nature conservation and sustainable use of natural resources worldwide.
Assertion (A): Conserving biodiversity is essential because it provides numerous direct economic benefits to humans. Reason (R):
The majority of medicinal products currently available are derived from a small fraction of plant species.- 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): Conserving biodiversity is essential because it provides numerous direct economic benefits to humans.
Reason (R):
The majority of medicinal products currently available are derived from a small fraction of plant species.
The majority of medicinal products currently available are derived from a small fraction of plant species.
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
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Rutuja Datta answered |
Understanding the Assertion and Reason
The assertion states that conserving biodiversity is essential due to the direct economic benefits it offers to humans. This is indeed true, as biodiversity contributes significantly to various sectors, including agriculture, pharmaceuticals, and ecosystem services.
Direct Economic Benefits of Biodiversity
- Medicinal Resources: A vast majority of medicines are derived from a variety of plants and animals.
- Agricultural Diversity: Diverse crops can improve food security and resilience against pests and diseases.
- Ecosystem Services: Healthy ecosystems provide services like pollination, water purification, and climate regulation, all of which have substantial economic value.
Evaluating the Reason
The reason asserts that most medicinal products come from a small fraction of plant species. This statement is also true, as a limited number of plant species have been extensively studied and utilized in pharmaceuticals.
Why the Reason Isn't the Correct Explanation
- Connection Between Assertion and Reason: While both statements are true, the reason does not directly explain why biodiversity conservation is crucial for economic benefits. The assertion emphasizes the broad spectrum of benefits from biodiversity, while the reason focuses specifically on medicinal products.
- Broader Implications: The assertion encompasses a wider range of economic benefits beyond just pharmaceuticals, including ecological balance and agricultural sustainability.
Conclusion
Thus, the correct answer is option 'B': both the assertion and reason are true, but the reason does not correctly explain the assertion. Conservation of biodiversity is vital for numerous economic benefits, not solely limited to medicinal products.
The assertion states that conserving biodiversity is essential due to the direct economic benefits it offers to humans. This is indeed true, as biodiversity contributes significantly to various sectors, including agriculture, pharmaceuticals, and ecosystem services.
Direct Economic Benefits of Biodiversity
- Medicinal Resources: A vast majority of medicines are derived from a variety of plants and animals.
- Agricultural Diversity: Diverse crops can improve food security and resilience against pests and diseases.
- Ecosystem Services: Healthy ecosystems provide services like pollination, water purification, and climate regulation, all of which have substantial economic value.
Evaluating the Reason
The reason asserts that most medicinal products come from a small fraction of plant species. This statement is also true, as a limited number of plant species have been extensively studied and utilized in pharmaceuticals.
Why the Reason Isn't the Correct Explanation
- Connection Between Assertion and Reason: While both statements are true, the reason does not directly explain why biodiversity conservation is crucial for economic benefits. The assertion emphasizes the broad spectrum of benefits from biodiversity, while the reason focuses specifically on medicinal products.
- Broader Implications: The assertion encompasses a wider range of economic benefits beyond just pharmaceuticals, including ecological balance and agricultural sustainability.
Conclusion
Thus, the correct answer is option 'B': both the assertion and reason are true, but the reason does not correctly explain the assertion. Conservation of biodiversity is vital for numerous economic benefits, not solely limited to medicinal products.
Chapter doubts & questions for Conserving Biodiversity - Biology 2025 is part of Grade 9 exam preparation. The chapters have been prepared according to the Grade 9 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Grade 9 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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