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Topic Biogeochemical cycles
Asked 2 times across 2 UPSC exams over 4 years (2021–2025), peaking in 2021.
Key insights
- Most tested in CSE — 1 of 2 PYQs
- Most asked in 2021
- Recurs across 2 years (2021–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 2021 → GEO 2025
How the concept evolved
Rising — more than half its appearances (2 of 2) 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.
GEO2025
Which one of the following biogeochemical cycles is sedimentary in nature?
- A Carbon cycle
- B Nitrogen cycle
- C Oxygen cycle
- D Phosphorus cycle ✓
✓ Correct answer: (D)
Environment & Ecology › Ecology & Ecosystems
CSE2021
In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?
- A Carbon cycle
- B Nitrogen cycle
- C Phosphorus cycle ✓
- D Sulphur cycle
✓ Correct answer: (C)
Environment & Ecology › Ecology & Ecosystems
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