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In the light reaction, plastoquinone carries electrons from

  • (a) PS I to NADP+ Your answer
  • (b) PS II to the cytochrome b6f complex Correct
  • (c) PS I to ATP synthase Your answer
  • (d) the cytochrome b6f complex to PS I Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

In the Z scheme, plastoquinone is a mobile carrier in the thylakoid membrane. It takes electrons from PS II and carries them to the cytochrome b6f complex, picking up protons from the stroma on the way.

Why the other options are wrong

  • (a) · your answer Electrons pass from PS I to NADP+ through ferredoxin, not plastoquinone.
  • (c) · your answer ATP synthase moves protons, not electrons; electrons never go from PS I to it.
  • (d) · your answer Electrons go from the cytochrome b6f complex to PS I through plastocyanin, not plastoquinone.
NCERT point: Order of carriers in non-cyclic flow: PS II → plastoquinone → cytochrome b6f → plastocyanin → PS I → ferredoxin → NADP+.
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