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Which one of the following is the source of electrons in photosynthesis?

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Which one of the following is the source of electrons in photosynthesis?

(a) Carbohydrates

(b) CO2

(c) Water

(d) NADH

I had been asked this question in exam.

This interesting question is from General Features of Photophosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry

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Correct choice is (c) Water

Easy explanation: Water is the source of electrons in photosynthesis. These electrons are required to reduce oxidized chlorophyll a molecules.

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