How is the rate of transpiration affected by decreasing humidity and by decreasing light intensity ?
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This question was previously asked in
UPSC CAPF – 2016
– Humidity affects the water potential gradient: Lower humidity in the air increases the difference in water potential between the leaf’s interior and the surrounding air, driving water vapor out faster.
– Light intensity affects stomatal opening: Generally, stomata open in the light to allow CO2 intake for photosynthesis. Reduced light intensity causes stomata to close, reducing water loss through transpiration.