Transpiration
Which factor most immediately reduces transpiration rate on a leaf surface?
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About This Question
- Subject
- biology
- Chapter
- plant physiology
- Topic
- transpiration
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
High humidity
- Transpiration Mechanism: Water moves out of the leaf because the water potential inside the leaf is higher than in the outside air.
- Effect of Humidity: High humidity means the air is already saturated with water vapor.
- Vapor Pressure Gradient: High external humidity decreases the diffusion gradient (difference in concentration) between the leaf interior and the atmosphere.
- Result: This slows down the rate of evaporation and diffusion through the stomata, thus reducing transpiration.
- Others: Temperature, wind, and light generally increase the rate of transpiration.
This easy difficulty biology question is from the chapter plant physiology, covering the topic of transpiration. It appeared in the 2025 exam.
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