Question

all plants give O2 in day and CO2 at night do you agree if yes then give reason

Answer 1

Hi mate I agree but trees give co2 during day also.

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.

Answer 2

Yes.

reason: Plants release oxygen in the process of photosynthesis.

            This process can occur only in the presence of sun, which is

            not possible during night. Also, plants give out CO2 when they

            perform respiration.