The role of oxygen in photosynthesis and in cellular respiration is: Oxygen is a product of photosynthesis and a reactant in cellular respiration.
Photosynthesis is the process whereby green plants manufacture their food using energy from the sunlight, carbon dioxide and water to synthesize food in form of glucose and produce oxygen as a by-product.
Cellular respiration is a metabolic process in living organisms whereby glucose is broken down with the aid of oxygen, to release chemical energy.
Thus, the role of oxygen in photosynthesis and in cellular respiration is: Oxygen is a product of photosynthesis and a reactant in cellular respiration.
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