Biology
Name the factors that affect the rate of transpiration. State their role in each case.
Transport in Plants
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Answer
The following main factors affect the rate of transpiration —
- Sunlight — During daytime, the rate of transpiration is faster. This is because the stomata remain open to allow the inward diffusion of carbon dioxide for photosynthesis. During night time, the stomata are closed, and hence transpiration hardly occurs.
- Temperature — Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises.
- Humidity — Transpiration is reduced if the air is humid. Air cannot hold any water molecules when it is already laden with moisture (humidity).
- Wind — Transpiration is more when the wind is blowing faster as water vapour moves away faster from the surface of leaves.
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