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In cyclic photophosphorylation, the excited electron from PS I

  • (a) is accepted by water to form H2O2 Your answer
  • (b) returns to PS I through the carriers Correct
  • (c) reduces NADP+ through NADP reductase Your answer
  • (d) passes on to PS II and then to water Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

In cyclic photophosphorylation, the excited electron from PS I passes through the carriers and returns to PS I, making ATP on the way.

Why the other options are wrong

  • (a) · your answer Water is not an electron acceptor here.
  • (c) · your answer NADP+ is not reduced in cyclic flow.
  • (d) · your answer Electrons do not pass to PS II in cyclic flow.
NCERT point: Cyclic flow: ATP only.
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