Which one of the following statements correctly describes the cyclic photophosphorylation?

Electrons are cycled in cyclic photophosphorylation.

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Cyclic photophosphorylation has both PS-I and PS-II.

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Water is the ultimate source of

e^{-}

in cyclic phosphorylation.

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Cyclic phosphorylation produces neither ATP nor NADPH +

H^{+}

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Solution

The correct option is A Electrons are cycled in cyclic photophosphorylation.
Cyclic photophosphorylation involves only photosystem I (P700). In each flow of electrons, 2 molecules of ATP are synthesised. NADPH is not produced. It is not connected with photolysis of water, so no oxygen is evolved.

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Which one of the following statements about the events of non-cyclic photophosphorylation is incorrect?

Which one of the following occurs in both cyclic and non-cyclic photophosphorylation?

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