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Cyclic photophosphorylation involves

  • (a) PS II only Your answer
  • (b) both PS I and PS II Your answer
  • (c) PS I only Correct
  • (d) neither photosystem Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Cyclic photophosphorylation involves PS I only: electrons from P700 return to it through the electron transport chain.

Why the other options are wrong

  • (a) · your answer PS II is not used in cyclic flow.
  • (b) · your answer Non-cyclic flow uses both photosystems.
  • (d) · your answer PS I is involved.
NCERT point: Cyclic flow makes ATP only; it occurs in the stroma lamellae.
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