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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.
So, technically, plants donât breathe. But plants do respire. Like animals, they use oxygen in the process of breaking down carbohydrates, and use the energy released for basic metabolic functions such as repairing and replacing tissues, and building complex molecules like proteins and oils. During respiration, plants, like us, release carbon dioxide and water vapor. Plants only photosynthesize in the presence of light, but they are continuously respiring, day and night. Even so, overall they release much more oxygen during photosynthesis than they consume during respiration!