BI-2019
Factors affecting transpiration
Biology · Secondary 4 · Hard · Factors affecting transpiration
On a very humid, still day after rain, the air around some shrubs is saturated with water vapour. Compared with a dry, breezy day at the same temperature, how will their rate of transpiration change?
- It decreases because the diffusion gradient for water vapour is smaller.
- It increases because humidity causes stomata to open wider.
- It is unchanged because humidity does not affect transpiration.
- It stops completely because water cannot evaporate at high humidity.
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