Biology
Which one of the following favours the fastest transpiration rate?
- A cool, humid, windy day,
- A hot, humid, windy day,
- A hot, humid, still day,
- A hot, dry, windy day.
Transport in Plants
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Answer
A hot, dry, windy day.
Reason — Transpiration is mainly affected by the temperature, humidity, and wind speed. On a hot, dry, windy day transpiration increases.
Cool temperature reduces evaporation, and high humidity reduces the diffusion of water vapour, resulting in slower transpiration. Hot temperature and wind increase transpiration, but high humidity slows it down by reducing the concentration gradient. Still air and high humidity greatly reduce transpiration, resulting in a very slow rate.
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P. Large surface area.
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