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Topic Anaerobic respiration
Asked 2 times across 2 UPSC exams over 2 years (2023–2025), peaking in 2023.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2023
- Recurs across 2 years (2023–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2023 → NDA 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.
NDA2025
The lactic acid that gets accumulated in the muscle cells during rigorous exercise causing muscle cramps is produced from
- A ATP
- B Pyruvate ✓
- C Ethanol
- D Glucose
✓ Correct answer: (B)
Science & Technology › Biology & Health
CDS2023
A sprinter feels cramps and pain in the thigh muscles after a run. This is due to accumulation of
- A lactic acid ✓
- B CO2
- C pyruvic acid
- D ethanol
✓ Correct answer: (A)
Science & Technology › Biology & Health
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