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NADP reductase is located on the

  • (a) lumen side of the thylakoid membrane Your answer
  • (b) stroma side of the thylakoid membrane Correct
  • (c) inner surface of the grana only Your answer
  • (d) outer membrane of the chloroplast Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

NADP reductase is on the stroma side of the thylakoid membrane, so NADPH is formed in the stroma.

Why the other options are wrong

  • (a) · your answer It faces the stroma, not the lumen.
  • (c) · your answer It is on the outer (stroma) surface, not the inner surface.
  • (d) · your answer The outer chloroplast membrane has no light-reaction enzymes.
NCERT point: Using stroma protons to make NADPH adds to the proton gradient.
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