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Transpiration increases in :
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- Hot, dry and windy condition
- Hot, damp and windy condition
- Cool, damp and windy condition
- Cool, dry and still condition
Correct Option: A
Conditions which increase the rate of evaporation also increase the rate of transpiration. Transpiration is more
rapid in hot, dry and windy conditions than it is in still or humid conditions. Plenty of light also speeds up
transpiration.
| Factor | Description | Explanation |
|---|---|---|
| Light | In bright light transpiration increases | The stomata (openings in the leaf) open wider to allow more carbon dioxide into the leaf for photosynthesis. |
| Temperature | Transpiration is faster in higher temperatures | Evaporation and diffusion are faster at higher temperatures |
| Wind | Transpiration is faster in windy conditions | Water vapour is removed quickly by air movement, speeding up diffusion of more water vapour out of the leaf |
| Humidity | Transpiration is slower in humid conditions | Diffusion of water vapour out of the leaf slows down if the leaf is already surrounded by moist air |
