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Best Answer: yes, plants use oxygen at night... However, plants can't produce glucose, carbohydrates and oxygen without light. To get through the night, most plants reverse the process of photosynthesis and breathe, like you and I, by burning carbohydrates and oxygen while producing carbon dioxide and water.
Plants themselves don't actually take in oxygen, they get it from the CO2 that they break down. During the growing season, in the daytime, plants also photosynthesize. This is a process in which plants reduce CO2 into organic molecules (which are used to make plant tissues or stored for later energy use).