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Cyclic photophosphorylation results in the formation of

  • (a) ATP and NADPH Your answer
  • (b) NADPH only Your answer
  • (c) ATP, NADPH and O2 Your answer
  • (d) ATP only Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

In cyclic photophosphorylation, electrons from PS I return to PS I through the electron transport chain. No electrons reach NADP+ and no water is split, so only ATP is formed.

Why the other options are wrong

  • (a) · your answer NADPH is not formed because the electrons cycle back to PS I instead of reducing NADP+.
  • (b) · your answer Cyclic flow makes ATP, and it makes no NADPH at all.
  • (c) · your answer Only non-cyclic flow, which involves PS II, releases O2 and makes NADPH.
NCERT point: Cyclic photophosphorylation happens when only light beyond 680 nm is available.
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