Photosynthesis is a process in which

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(A) Photosynthesis is a physico-chemical process by which green plants use light energy to drive the synthesis of organic compounds.In this process,$C

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$CO_2$ is reduced to carbohydrate

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(A) Photosynthesis is a physico-chemical process by which green plants use light energy to drive the synthesis of organic compounds.In this process,$CO_2$ is reduced to carbohydrates (glucose) using the energy derived from light (photophosphorylation) and the reducing power of $NADPH$.Option $A$ is correct because the Calvin cycle involves the reduction of $CO_2$ to form sugars.Option $B$ is incorrect as $NAD^+$ is reduced to $NADH$ in respiration,not photosynthesis.Option $C$ is a part of the process (photophosphorylation),but the primary definition of photosynthesis is the conversion of light energy into chemical energy stored in carbohydrates.Option $D$ is a process that occurs in mitochondria during cellular respiration,not in chloroplasts.

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