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Civil Services Prep
Prelims•UPSC Civil Services Examination

Environment & Ecology

Explore previous year questions, practice with self-assessments, and review explanations.

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2026Protected Areas
Question 1

A biodiversity hotspot is identified using high endemism and what other criterion?

4 options
2025Climate Change
Question 2

The Montreal Protocol is primarily concerned with substances that deplete what?

4 options
2025Pollution
Question 3

The food chain energy transfer between trophic levels is generally what?

4 options
2024Biodiversity
Question 4

Which gas is the largest contributor to human-caused long-lived greenhouse warming?

4 options
2024Conservation
Question 5

Which of these is an example of an invasive alien species?

4 options
2024Climate Change
Question 6

Which international agreement addresses trade in endangered wild fauna and flora?

4 options
2024Conservation
Question 7

Which energy source is renewable?

4 options
2024Conservation
Question 8

Which of the following is a nature-based climate solution?

4 options
2023Biodiversity
Question 9

Project Tiger was launched primarily to conserve which animal?

4 options
2023Biodiversity
Question 10

The Convention on Biological Diversity was opened for signature at which summit?

4 options
2022Climate Change
Question 11

Ramsar sites are designated for conservation of which ecosystems?

4 options
2022Protected Areas
Question 12

Eutrophication of a lake is commonly caused by excess input of what?

4 options
2022Climate Change
Question 13

Which pollutant is a major precursor of acid rain?

4 options
2021Pollution
Question 14

The ozone layer is mainly located in which atmospheric layer?

4 options
2021Pollution
Question 15

Which Indian law provides a broad framework for environmental protection?

4 options
2021Protected Areas
Question 16

What is the main purpose of wildlife corridors?

4 options
2020Pollution
Question 17

A carbon sink is a system that does what?

4 options
2020Protected Areas
Question 18

Which of the following best describes ecological succession?

4 options
2020Conservation
Question 19

Coral bleaching is commonly triggered by what?

4 options
2020Biodiversity
Question 20

Which biome is characterised by permafrost and low-growing vegetation?

4 options