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The Z scheme of the light reaction describes

  • (a) the reduction of NAD+ to NADH in the stroma Your answer
  • (b) the path of electrons from water through PS II and PS I to NADP+ Correct
  • (c) the reduction of CO2 to sugar in the Calvin cycle Your answer
  • (d) the regeneration of RuBP from triose phosphate Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

The Z scheme shows the path of electrons from water through PS II, the electron transport chain and PS I to NADP+. Drawn by energy levels, the path looks like the letter Z.

Why the other options are wrong

  • (a) · your answer NAD+ reduction is part of respiration, not the Z scheme.
  • (c) · your answer Reduction of CO2 to sugar is the Calvin cycle (dark reaction).
  • (d) · your answer RuBP regeneration is the last stage of the Calvin cycle.
NCERT point: The Z scheme is the non-cyclic flow of electrons in the light reaction.
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