Biology · Plant Physiology
Which of the following correctly explains why the transpiration rate is higher at midday compared to early morning, even if the stomatal aperture is the same at both times?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Stomatal frequency increases during midday due to solar radiation
- 2Root pressure is higher at midday, pushing more water into the leaf
- 3Higher midday temperature and lower relative humidity together steepen the diffusion gradient for water vapour from leaf to atmosphere✓
- 4Chloroplasts are more active at midday, pumping more K+ into guard cells
Correct answer
Higher midday temperature and lower relative humidity together steepen the diffusion gradient for water vapour from leaf to atmosphere
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