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No O2 is evolved during cyclic photophosphorylation because

  • (a) ATP synthase consumes the O2 formed Your answer
  • (b) PS II, linked to water splitting, does not work Correct
  • (c) NADP+ absorbs the O2 that is released Your answer
  • (d) PS I splits water but uses up the O2 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

No O2 is evolved in cyclic flow because PS II, which is linked to the splitting of water, does not work.

Why the other options are wrong

  • (a) · your answer ATP synthase does not consume O2.
  • (c) · your answer NADP+ does not absorb O2.
  • (d) · your answer PS I does not split water.
NCERT point: O2 comes from water, split by PS II.
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