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The primary acceptor of PS II passes electrons to a hydrogen carrier, which

  • (a) splits water directly on the stroma side Your answer
  • (b) reduces NADP+ to NADPH on the lumen side Your answer
  • (c) takes a proton from the lumen and releases it into the stroma Your answer
  • (d) takes a proton from the stroma and releases it into the lumen Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

The hydrogen carrier (plastoquinone) takes a proton from the stroma while moving electrons and releases it into the lumen. This adds to the proton gradient.

Why the other options are wrong

  • (a) · your answer Water is split by PS II on the lumen side, not by the carrier.
  • (b) · your answer NADP+ is reduced on the stroma side by NADP reductase.
  • (c) · your answer This is the reverse direction.
NCERT point: Proton transport by the carrier is one of three causes of the gradient.
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