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All questions of Biodiversity for UPSC CSE Exam
Assertion (A): The number of green pages in the Red Data Book is relatively low.
Reason (R): Green pages indicate species that have moved out of the endangered category due to successful conservation efforts.- a)Both A and R are true, and R is the correct explanation of A.
- b)Both A and R are true, but R is not the correct explanation of A.
- c)A is true, but R is false.
- d)A is false, but R is true.
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): The number of green pages in the Red Data Book is relatively low.
Reason (R): Green pages indicate species that have moved out of the endangered category due to successful conservation efforts.
Reason (R): Green pages indicate species that have moved out of the endangered category due to successful conservation efforts.
a)
Both A and R are true, and R is the correct explanation of A.
b)
Both A and R are true, but R is not the correct explanation of A.
c)
A is true, but R is false.
d)
A is false, but R is true.
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Lakshya Ias answered |
The low number of green pages reflects the limited success of conservation efforts in moving species out of endangered status.
Which of the following is an example of a foundation species?- a)Bengal Tiger
- b)Kelp in kelp forests
- c)Atlantic Puffin
- d)Indian Elephant
Correct answer is option 'B'. Can you explain this answer?
Which of the following is an example of a foundation species?
a)
Bengal Tiger
b)
Kelp in kelp forests
c)
Atlantic Puffin
d)
Indian Elephant
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Academic Studio answered |
Kelp is a dominant primary producer in its ecosystem, making it a foundation species.
Which of the following is NOT a criterion for classifying a species as Vulnerable?- a)A population size fewer than 10,000 mature individuals
- b)A reduction in population size of more than 50% over the last 10 years
- c)A probability of extinction in the wild of at least 10% within 100 years
- d)A population size fewer than 250 mature individuals
Correct answer is option 'D'. Can you explain this answer?
Which of the following is NOT a criterion for classifying a species as Vulnerable?
a)
A population size fewer than 10,000 mature individuals
b)
A reduction in population size of more than 50% over the last 10 years
c)
A probability of extinction in the wild of at least 10% within 100 years
d)
A population size fewer than 250 mature individuals
|
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Academic Studio answered |
A population size fewer than 250 mature individuals is a criterion for classifying a species as Endangered, not Vulnerable.
Which IUCN category applies to a species with a probability of extinction in the wild of at least 20% within 20 years?- a)Vulnerable (VU)
- b)Endangered (EN)
- c)Critically Endangered (CR)
- d)Near Threatened (NT)
Correct answer is option 'B'. Can you explain this answer?
Which IUCN category applies to a species with a probability of extinction in the wild of at least 20% within 20 years?
a)
Vulnerable (VU)
b)
Endangered (EN)
c)
Critically Endangered (CR)
d)
Near Threatened (NT)
|
|
Lakshya Ias answered |
The Endangered category includes species with a high risk of extinction, as defined by the stated probability.
What does the increasing number of pink pages in the Red Data Book signify?- a)More species are becoming extinct.
- b)More species are being classified as Critically Endangered.
- c)Conservation efforts are becoming more successful.
- d)The overall number of species is increasing.
Correct answer is option 'B'. Can you explain this answer?
What does the increasing number of pink pages in the Red Data Book signify?
a)
More species are becoming extinct.
b)
More species are being classified as Critically Endangered.
c)
Conservation efforts are becoming more successful.
d)
The overall number of species is increasing.
|
Master Training Institute answered |
Pink pages represent critically endangered species; an increase indicates a growing number of species falling into this high-risk category.
Assertion (A): The number of pink pages in the Red Data Book is increasing.
Reason (R): More species are being classified as Critically Endangered.- a)Both A and R are true, and R is the correct explanation of A.
- b)Both A and R are true, but R is not the correct explanation of A.
- c)A is true, but R is false.
- d)A is false, but R is true.
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): The number of pink pages in the Red Data Book is increasing.
Reason (R): More species are being classified as Critically Endangered.
Reason (R): More species are being classified as Critically Endangered.
a)
Both A and R are true, and R is the correct explanation of A.
b)
Both A and R are true, but R is not the correct explanation of A.
c)
A is true, but R is false.
d)
A is false, but R is true.
|
Valor Academy answered |
Pink pages represent critically endangered species. The increase in pink pages indicates a rise in the number of species falling into this category.
Arrange the following IUCN categories in the order of increasing risk of extinction: - Vulnerable (VU)
- Endangered (EN)
- Near Threatened (NT)
- Critically Endangered (CR)
- a)3, 1, 2, 4
- b)3, 2, 1, 4
- c)1, 3, 2, 4
- d)4, 3, 2, 1
Correct answer is option 'A'. Can you explain this answer?
Arrange the following IUCN categories in the order of increasing risk of extinction:
- Vulnerable (VU)
- Endangered (EN)
- Near Threatened (NT)
- Critically Endangered (CR)
a)
3, 1, 2, 4
b)
3, 2, 1, 4
c)
1, 3, 2, 4
d)
4, 3, 2, 1
|
EduRev UPSC answered |
Near Threatened has the least risk, followed by Vulnerable, Endangered, and Critically Endangered with the highest risk.
A keystone species is essential in an ecosystem because:- a)It is the most abundant species.
- b)It has the largest geographical range.
- c)Its loss can lead to significant changes in the ecosystem.
- d)It is the top predator.
Correct answer is option 'C'. Can you explain this answer?
A keystone species is essential in an ecosystem because:
a)
It is the most abundant species.
b)
It has the largest geographical range.
c)
Its loss can lead to significant changes in the ecosystem.
d)
It is the top predator.
|
Anagha Kaur answered |
Understanding Keystone Species
Keystone species play a critical role in maintaining the structure and health of an ecosystem. Their presence or absence can have significant impacts on the environment and the organisms that inhabit it.
Significance of Option C
- The correct answer is C: Its loss can lead to significant changes in the ecosystem.
- Keystone species have a disproportionately large effect on their environment relative to their abundance.
Examples of Keystone Species
- Predators: Some top predators control the population of herbivores, preventing overgrazing and allowing diverse plant species to thrive. For instance, the sea otter is a keystone species that helps maintain kelp forest ecosystems by preying on sea urchins.
- Ecosystem Engineers: Species like beavers alter their environment by creating wetlands, which benefit various organisms. Their absence can lead to habitat loss for many aquatic and terrestrial species.
Impact of Loss
- When a keystone species is removed, it can set off a chain reaction:
- Population Imbalance: Herbivore populations may explode without predators, leading to overconsumption of vegetation.
- Biodiversity Decline: The loss of plant species affects other organisms that depend on them for food and habitat.
- Ecosystem Collapse: Ultimately, this can lead to a collapse of the ecosystem, affecting all species within it.
Conclusion
Understanding the role of keystone species is vital for conservation efforts. Protecting these species helps maintain ecological balance, ensuring the survival of diverse ecosystems.
Keystone species play a critical role in maintaining the structure and health of an ecosystem. Their presence or absence can have significant impacts on the environment and the organisms that inhabit it.
Significance of Option C
- The correct answer is C: Its loss can lead to significant changes in the ecosystem.
- Keystone species have a disproportionately large effect on their environment relative to their abundance.
Examples of Keystone Species
- Predators: Some top predators control the population of herbivores, preventing overgrazing and allowing diverse plant species to thrive. For instance, the sea otter is a keystone species that helps maintain kelp forest ecosystems by preying on sea urchins.
- Ecosystem Engineers: Species like beavers alter their environment by creating wetlands, which benefit various organisms. Their absence can lead to habitat loss for many aquatic and terrestrial species.
Impact of Loss
- When a keystone species is removed, it can set off a chain reaction:
- Population Imbalance: Herbivore populations may explode without predators, leading to overconsumption of vegetation.
- Biodiversity Decline: The loss of plant species affects other organisms that depend on them for food and habitat.
- Ecosystem Collapse: Ultimately, this can lead to a collapse of the ecosystem, affecting all species within it.
Conclusion
Understanding the role of keystone species is vital for conservation efforts. Protecting these species helps maintain ecological balance, ensuring the survival of diverse ecosystems.
What does a taxon labeled as 'Data Deficient' in the IUCN Red List indicate?- a)The species is extinct.
- b)There is insufficient information to assess its risk of extinction.
- c)The species is abundant and widespread.
- d)The species is not a priority for conservation.
Correct answer is option 'B'. Can you explain this answer?
What does a taxon labeled as 'Data Deficient' in the IUCN Red List indicate?
a)
The species is extinct.
b)
There is insufficient information to assess its risk of extinction.
c)
The species is abundant and widespread.
d)
The species is not a priority for conservation.
|
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Academic Studio answered |
'Data Deficient' indicates a lack of enough information to classify the species in any other risk category.
Indicator species are crucial for:- a)Indicating the overall health of an ecosystem.
- b)Signaling the presence of a specific set of other species.
- c)Indicating the most populous species.
- d)Representing the most endangered species.
Correct answer is option 'B'. Can you explain this answer?
Indicator species are crucial for:
a)
Indicating the overall health of an ecosystem.
b)
Signaling the presence of a specific set of other species.
c)
Indicating the most populous species.
d)
Representing the most endangered species.
|
Future Foundation Institute answered |
Indicator species are used to signify the presence of certain environmental conditions and specific sets of species.
Which of the following species is categorized as Critically Endangered?- a)Great Indian Bustard
- b)Asian Elephant
- c)Bengal Tiger
- d)Indian Peafowl
Correct answer is option 'A'. Can you explain this answer?
Which of the following species is categorized as Critically Endangered?
a)
Great Indian Bustard
b)
Asian Elephant
c)
Bengal Tiger
d)
Indian Peafowl
|
|
Valor Academy answered |
According to the information provided, the Great Indian Bustard is listed as Critically Endangered.
Which category in the Red Data Book indicates species that were once endangered but have now recovered?- a)Pink Pages
- b)Green Pages
- c)Red Pages
- d)Blue Pages
Correct answer is option 'B'. Can you explain this answer?
Which category in the Red Data Book indicates species that were once endangered but have now recovered?
a)
Pink Pages
b)
Green Pages
c)
Red Pages
d)
Blue Pages
|
|
EduRev UPSC answered |
Green pages denote species that were endangered but are no longer under threat.
What does the presence of Indicator species in an ecosystem indicate?- a)High biodiversity
- b)Specific environmental conditions
- c)Presence of keystone species
- d)Efficient ecosystem management
Correct answer is option 'B'. Can you explain this answer?
What does the presence of Indicator species in an ecosystem indicate?
a)
High biodiversity
b)
Specific environmental conditions
c)
Presence of keystone species
d)
Efficient ecosystem management
|
|
Valor Academy answered |
Indicator species signal the presence of certain environmental conditions such as pollution, climate change, etc.
The primary role of foundation species in an ecosystem is to:- a)Act as top predators.
- b)Be the most populous species.
- c)Be the dominant primary producer in terms of abundance and influence.
- d)Indicate environmental changes.
Correct answer is option 'C'. Can you explain this answer?
The primary role of foundation species in an ecosystem is to:
a)
Act as top predators.
b)
Be the most populous species.
c)
Be the dominant primary producer in terms of abundance and influence.
d)
Indicate environmental changes.
|
Goel UPSC Coaching Center answered |
Foundation species play a fundamental role in creating and defining an ecosystem, often being the primary producers and providing critical support for other species.
Match the Pairs
- a)1-A, 2-B, 3-C
- b)1-C, 2-B, 3-A
- c)1-A, 2-C, 3-B
- d)1-B, 2-A, 3-A
Correct answer is option 'A'. Can you explain this answer?
Match the Pairs
a)
1-A, 2-B, 3-C
b)
1-C, 2-B, 3-A
c)
1-A, 2-C, 3-B
d)
1-B, 2-A, 3-A
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Upsc Toppers answered |
The given options correctly define the respective IUCN categories.
A species categorized as 'Data Deficient' by the IUCN:- a)Is on the brink of extinction.
- b)Has insufficient information to assess its risk of extinction.
- c)Is abundant and not in danger.
- d)Has been recently discovered and not yet assessed.
Correct answer is option 'B'. Can you explain this answer?
A species categorized as 'Data Deficient' by the IUCN:
a)
Is on the brink of extinction.
b)
Has insufficient information to assess its risk of extinction.
c)
Is abundant and not in danger.
d)
Has been recently discovered and not yet assessed.
|
|
Master Training Institute answered |
'Data Deficient' indicates that there is not enough information available to classify the species under a specific risk category.
What is the primary function of keystone species in an ecosystem?- a)They are the most numerous species in the ecosystem.
- b)They regulate the population of other species and maintain ecosystem balance.
- c)They are primarily responsible for pollination.
- d)They have the largest biomass.
Correct answer is option 'B'. Can you explain this answer?
What is the primary function of keystone species in an ecosystem?
a)
They are the most numerous species in the ecosystem.
b)
They regulate the population of other species and maintain ecosystem balance.
c)
They are primarily responsible for pollination.
d)
They have the largest biomass.
|
|
Upsc Toppers answered |
Keystone species play a critical role in maintaining the structure of an ecological community, influencing other species' populations and the overall balance.
Match the Pairs
- a)1-A-2-C-3-B
- b)1-A-2-B-3-C
- c)1-B-2-C-3-A
- d)1-C-2-B-3-A
Correct answer is option 'A'. Can you explain this answer?
Match the Pairs
a)
1-A-2-C-3-B
b)
1-A-2-B-3-C
c)
1-B-2-C-3-A
d)
1-C-2-B-3-A
|
Capstone Ias Learning answered |
The definitions of these categories match with the given statements based on the IUCN's criteria for classification.
The Red Data Book's use of 'Red' symbolically represents:- a)The financial cost of conservation.
- b)The danger faced by plants and animals globally.
- c)The urgency of scientific research.
- d)The geographical areas most affected by species extinction.
Correct answer is option 'B'. Can you explain this answer?
The Red Data Book's use of 'Red' symbolically represents:
a)
The financial cost of conservation.
b)
The danger faced by plants and animals globally.
c)
The urgency of scientific research.
d)
The geographical areas most affected by species extinction.
|
|
Future Foundation Institute answered |
The term 'Red' symbolizes the critical danger that numerous species around the world are facing.
Which of the following is true about a taxon labeled as 'Not Evaluated'?- a)It is considered extinct.
- b)It has not yet been assessed against the IUCN criteria.
- c)It is abundant and faces no immediate threat.
- d)It is under immediate threat of extinction.
Correct answer is option 'B'. Can you explain this answer?
Which of the following is true about a taxon labeled as 'Not Evaluated'?
a)
It is considered extinct.
b)
It has not yet been assessed against the IUCN criteria.
c)
It is abundant and faces no immediate threat.
d)
It is under immediate threat of extinction.
|
|
Master Training Institute answered |
'Not Evaluated' means the species hasn't been assessed for its risk of extinction according to the IUCN's criteria.
Chapter doubts & questions for Biodiversity - Environment for UPSC CSE 2025 is part of UPSC CSE exam preparation. The chapters have been prepared according to the UPSC CSE exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for UPSC CSE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Environment for UPSC CSE
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