Question

all plants give oxygen during the day and carbon dioxide during night

Answer 1

yes its true because plants give out oxygen by the process of photosynthesis

Answer 2

its wrong, Plants give out carbon dioxide not only at night but during the day too. It happens because of the process of respiration in which plants take in oxygen and  give  out  carbon dioxide. As soon as the sun rises another process called photosynthesis starts, in which carbon dioxide is taken in and oxygen is given out.
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