Air containing Carbon dioxide and Oxygen enters the plant through these openings. The ratio of carbon dioxide to oxygen consumption is more as most of it is used in for photosynthesis and some of the oxygen is consumed for respiration and a major amount of oxygen goes out as the by-product(but this happens only during the day). At night, oxygen is used in large amounts for respiration. Water vapour is also released in the process called as Transpiration .
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