Actually, it is not oxygen that they find important, but carbon dioxide. Photosynthetic plants require carbon dioxide and sunlight to survive. Oxygen is a byproduct of the photosynthesis process, which humans require for breathing.
Unlike animals, plants create oxygen during photosynthesis while they harvest energy from the sun that is stored in the form of sugars. However, just like animals when plants break down those sugars to get energy they use up oxygen and produce carbon dioxide, so in theory a plant kept in an environment where no oxygen could accumulate in the air will die just like an animal would.
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