from where oxygen comes in night when no photosynthesis



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    Because photosynthesis relies on light, it does not occur at night, and so plants do not produce oxygen.  Not only that, but plants actually use up oxygen in the process of cellular respiration, just like animals.  While cellular respiration occurs in plants both day and night, photosynthesis only takes place during the day. Thus, plants actually decrease the amount of oxygen during the night (though to a worrying extent).  At night, oxygen doesn’t come from anywhere, and it’s up to plants to produce enough of it during the day.

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