# Ecology and Biodiversity UPSC Prelims PYQ Topic Wise

> Ecology and Biodiversity UPSC Prelims PYQs: all 77 questions from 11 official papers (2016–2026), by concept with official answers. Asked in 11 of 11 years.

Source: https://previousyearquestions.app/upsc-cse/topics/ecology-biodiversity/

Explore: <a href="/upsc-cse/topics/">All UPSC Prelims topics</a> · <a href="/upsc-cse/">UPSC CSE hub</a> · <a href="/upsc-cse/syllabus-pattern/">Syllabus & pattern</a> · <a href="/upsc-cse/2026/">UPSC 2026</a>

## Answer first

Ecology and Biodiversity PYQs (previous year questions) for UPSC Prelims: Ecology and Biodiversity (Environment) had **77 questions** across the 11 official UPSC Prelims papers we tagged (2016–2026), and appeared in 11 of them. Asked in 11 of 11 years. The concepts asked in the most papers: Protected Areas, Fauna, Fauna of India.

## Year-wise question count

<ChapterQuestions exam="upsc-cse" chapter="ecology-biodiversity" part="trend" />

## Most-asked concepts

Sorted by the number of papers a concept appeared in.

<ChapterQuestions exam="upsc-cse" chapter="ecology-biodiversity" part="concepts" />

## How to practise Ecology and Biodiversity PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year's Ecology and Biodiversity questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

## Questions by year

Each line gives the question number, type, concept, our one-line summary and the official answer, with a link to the official PDF.

<ChapterQuestions exam="upsc-cse" chapter="ecology-biodiversity" part="questions" />

## Other Environment topics

- [Climate Change, Pollution and Conventions PYQs](/upsc-cse/topics/climate-pollution/)

## FAQ

### How many Ecology and Biodiversity questions come in UPSC Prelims?
In the official papers we tagged: 6 in 2026, 3 in 2025, 9 in 2024, 10 in 2023, 7 in 2022, 9 in 2021, 8 in 2020, 6 in 2019, 4 in 2018, 8 in 2017 and 7 in 2016. That is 77 questions in all, about 51% of Environment.

### Which Ecology and Biodiversity topics repeat in UPSC Prelims?
Asked in the most papers: Protected Areas, Fauna, Fauna of India. The concept table lists every one with its count.

### Are these official UPSC Prelims questions?
Yes. Every question is from an official UPSC Prelims paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.