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In the Z scheme, after electrons leave PS II they pass through a chain of carriers including cytochromes and move

  • (a) directly to NADP+ Your answer
  • (b) downhill in terms of redox potential Correct
  • (c) back to water Your answer
  • (d) uphill in terms of redox potential Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

After leaving PS II, electrons pass downhill (in terms of redox potential) through carriers including cytochromes, releasing energy that is used to pump protons.

Why the other options are wrong

  • (a) · your answer They reach NADP+ only after PS I.
  • (c) · your answer They do not return to water.
  • (d) · your answer Electrons move uphill only at the photosystems, when light excites them.
NCERT point: NCERT: electrons move downhill, in terms of the redox potential scale, between PS II and PS I.
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