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Topic Ecological succession
Asked 7 times across 3 UPSC exams over 11 years (2013–2024), peaking in 2022.
Key insights
- Most tested in GEO — 4 of 7 PYQs
- Most asked in 2022
- Recurs across 6 years (2013–2024)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 2013 → CDS 2019 → GEO 2022
How the concept evolved
Rising — more than half its appearances (5 of 7) are since 2016.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
GEO2024
Which one of the following is the appropriate sequential order of ecological succession ?
- A Invasion – Nudation – Competition and coaction – Reaction – Stabilization
- B Nudation – Invasion – Competition and coaction – Reaction – Stabilization ✓
- C Nudation – Invasion – Reaction – Competition and coaction – Stabilization
- D Invasion – Nudation – Reaction – Competition and coaction – Stabilization
✓ Correct answer: (B)
Environment & Ecology › Ecology & Ecosystems
GEO2023
Which one of the following is the most important stage in the process of ecological succession?
- A Claim
- B Acceptance by community members
- C Reaction ✓
- D Settlement
✓ Correct answer: (C)
Environment & Ecology › Ecology & Ecosystems
GEO2022
A juvenile ecosystem is characterized by energy usage which is primarily directed towards
- A multiplication and growth of organisms ✓
- B maintenance of biocenose
- C conservation of biocenose
- D reduced growth of plants
✓ Correct answer: (A)
Environment & Ecology › Ecology & Ecosystems
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