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Write a short on the net gaseous exchange event that takes place in the leaves of a plant.

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During the night, in the absence of photosynthesis, carbon dioxide is released but not used up by the plants. Hence, at night CO2 elimination is the major exchange activity that goes on. Thus, net gas exchange in leaves at night is:

O2 diffuses in; CO2 diffuses out

During the day, oxygen is released instead of carbon dioxide. Instead, CO2 generated during respiration is used up by the plants for photosynthesis. Therefore, oxygen release becomes the major event this time. Thus, net gas exchange in leaves during day time is:

O2 diffuses out ; CO2 diffuses in

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Ritika Jonwal

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