Question

why do plants leave oxygen in the air

Answer 1

Answer:

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Plants, on the other hand, make their own carbohydrates when they photosynthesize, and their cells use up those same carbohydrates through respiration. Oxygen, for plants, is essential because it makes the process of respiration more efficient (known as aerobic respiration). Plant cells are respiring constantly.

Answer 2

They respire as like animal's . They leave oxygen during the day in present of sunlight through pores which present in surface of leaves. During photosynthesis they need carbon dioxide which they take from atmosphere and release oxygen in air.