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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.
In animals they only use cellular respiration. In both. In plants they use photosynthesis during the day and at night they use cellular respiration because there is no sun to produce the energy needed with photosynthesis. In animals they only use cellular respiration.