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Question

Which one of the following statements correctly describes cyclic photophosphorylation?

A
Cyclic photophosphorylation involves both PS-I and PS-II
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B
Cyclic photophosphorylation produces neither ATP nor NADPH+H+
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C
Water is the ultimate source of e- in cyclic phosphorylation
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D
There is cyclic flow of electrons
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Solution

The correct option is D There is cyclic flow of electrons
In cyclic photophosphorylation, only PS-I is involved. The electrons released from PS-I are cycled back to the same photosystem. Hence, the source of electrons is not water in cyclic photophosphorylation. ATP is synthesised during cyclic photophosphorylation but NADPH + H+ is not synthesised.


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