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Question

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

A
ATP
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B
NADPH2
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C
O2
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D
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 O2, NADPH2 and ATP. The NADPH2 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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