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NADP+ is reduced to NADPH in

1. PS I
2. PS II
3. Calvin cycle
4. Noncyclic photophosphorylation

Correct answer: Noncyclic photophosphorylation

Solution

In noncyclic photophosphorylation, electrons flow from water through PS II and PS I to NADP+, which is reduced to NADPH by NADP+ reductase. PS I alone provides the electrons for this reduction, but the full process is part of noncyclic photophosphorylation.

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