does plants only give out oxygen in day time and carbondioxide at night time ?could you please explain.

Dear Student!

Plants release oxygen only when they are photosynthesizing but they respire day and night and also release carbon dioxide during day but the amount of oxygen released is so large that it negates the amount of carbon dioxide released. At night the photosynthesis stops but respiration continues and carbon dioxide is released but there is no oxygen is liberated to negate this. Hence, the effect of release of carbon dioxide can be felt at night and not during day.

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 yes, plants give out oxygen in day time because they get sunlight to make their food which releases oxygen from the plants. But at night there is no sunlight. So they take in oxygen and give out carbondioxide at night. 

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