Which of the following is a by-product of a light reaction?

ATP

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NADPH

_{2}

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_{2}

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All of the above

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Solution

The correct option is D All of the above
The light reaction involves photophosphorylation and photolysis of water which releases O $_{2}$ , NADPH $_{2}$ and ATP. The NADPH $_{2}$ and ATP is synthesised during non-cyclic photophosphorylation, only ATP during cyclic photophosphorylation. Due to photolysis water breaks down and oxygen is evolved as a by-product.
So, the correct answer is option D.

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