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Topic Transpiration
Asked 7 times across 5 UPSC exams over 11 years (2014–2025), peaking in 2018.
Key insights
- Most tested in CSE — 2 of 7 PYQs
- First appeared in CDS 2014 — 4 years before CSE 2018 (allied exams preview CSE)
- Most asked in 2018
- Recurs across 6 years (2014–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2014 → CAPF 2016 → CSE 2018 → NDA 2021 → GEO 2025
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.
GEO2025
Which one of the following is the main driver in explaining the cohesion-tension-transpiration pull model of water transport in plants?
- A Evapotranspiration
- B Transpiration ✓
- C Cohesion process
- D Surface tension
✓ Correct answer: (B)
Science & Technology › Biology & Health
CDS2023
Water goes up through xylem vessels in tall trees. The process in plants and properties of water that help in upward movement are :
- A Respiration and cohesion
- B Transpiration pull, cohesion and adhesion ✓
- C Root pressure, cohesion and adhesion
- D Transpiration and adhesion
✓ Correct answer: (B)
Science & Technology › Biology & Health
NDA2021
In a dicot pot herb, vaseline/vegetable oil was applied on the upper surface of one leaf (Experimental leaf 1) and on the lower surface of another leaf (Experimental leaf 2). Vaseline/Vegetable oil was not applied on the control leaf. The plant was deliberately not watered for several days. Which leaf will dry up last ?
- A Experimental leaf 1
- B Experimental leaf 2 ✓
- C Control leaf
- D All the leaves will dry up simultaneously
✓ Correct answer: (B)
Science & Technology › Biology & Health
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