1. No, I do not agree with this statement. Plants photosynthesize during daytime only and respire during the daytime as well as night time also.
2. During daytime when photosynthesis occurs in the presence of sunlight. Oxygen is produced. The leaves use some of this oxygen for respiration and the rest diffuses into air.
3. During daytime CO2 produced by respiration is all used up in photosynthesis by leaves.
4. At night time no photosynthesis occurs and oxygen diffuses into leaves to carryout respiration.
