The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant. This process is to change the energy in sunlight into the energy in sugar, the end product of photosynthesis. Photosynthesis of water resulting H+ion for the reduction of NADPH2.
So, the correct option is, 'photolysis of water'.
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(iii) Organic food
(iv) Light reaction
(v) Photolysis in photosynthesis
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