Respiration
The gaseous exchange in plant is not very evident during the daytime as the products of respiration.
I.e. carbon dioxide and water are the reactions in the process of photosynthesis......
So the carbon dioxide and water produced in the respiration are utilized in photosynthesis, occurring in the daylight. In the bright sunshine, because of high rate photosynthesis the carbon dioxide produced in respiration falls short and therefore, some carbon dioxide has to be taken into the plant form outside for photosynthesis.
In the day time the plant therefore, takes in carbon dioxide and expel out oxygen. The process of photosynthesis occurs in chloroplasts whereas the process of respiration takes place in cytoplasm and mitochondria.
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