Biology for IGCSE & O level - Transport In Plants (Section 6 - No. 10)
What is the effect of humidity on the rate of transpiration?
Higher humidity increases transpiration.
Humidity has no effect on transpiration.
Higher humidity decreases transpiration.
Humidity increases then decreases transpiration.
Explanation
High humidity reduces the rate of transpiration because the water potential gradient between the leaf and the air is reduced.
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