In photosynthesis, water is the reactant while in respiration it is a product.
The process of forming food and energy from the inorganic compounds and the solar energy with the help of the pigments in the plant cells is called photosynthesis.
What is the role of water in both processes?
The process of photosynthesis is a method of producing food and generally happens in the plant cell. The process uses water as the reactant and combines it with atmospheric carbon dioxide to yield glucose and oxygen.
While cellular respiration is the process that occurs in animals and is a reverse reaction to that of photosynthesis as it utilizes the energy in the form of glucose and combines it with oxygen to form carbon dioxide and water.
Therefore, option D is correct.
Learn more about cellular respiration and photosynthesis here:
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