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Which of the following is NOT a product of the light reaction of photosynthesis?

(a) ATP Your answer
(b) NADPH Your answer
(c) NADH Correct
(d) oxygen Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

The light reaction produces ATP, NADPH and oxygen. NADH is made in respiration (glycolysis and the Krebs cycle), not in photosynthesis.

Why the other options are wrong

(a) · your answer ATP is made in the light reaction by photophosphorylation.
(b) · your answer NADPH is made when electrons from PS I reduce NADP⁺.
(d) · your answer Oxygen is released when water is split in the light reaction.

NCERT point: ATP and NADPH from the light reaction are used to fix CO₂ in the Calvin cycle.

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