transpiration

Question

Which factor most immediately reduces transpiration rate on a leaf surface?

RankGuru · Accepted Answer

1. **Transpiration Mechanism**: Water moves out of the leaf because the water potential inside the leaf is higher than in the outside air.
2. **Effect of Humidity**: **High humidity** means the air is already saturated with water vapor.
3. **Vapor Pressure Gradient**: High external humidity decreases the diffusion gradient (difference in concentration) between the leaf interior and the atmosphere.
4. **Result**: This slows down the rate of evaporation and diffusion through the stomata, thus **reducing transpiration**.
5. **Others**: Temperature, wind, and light generally **increase** the rate of transpiration.

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