oxygen from the air diffuses into a leaf and reaches all the cells for respiration. carbon dioxide produced during respiration is released into the air through the stomata. in plants, respiration occurs during the day as well as during the night.
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This happens as follows: Oxygen from the air enters into a leaf through stomata and reaches all the cells by the process of diffusion. This oxygen is used in respiration in cells of the leaf. The carbon dioxide produced during diffuses out from the leaf into the air through same stomata.
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