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Which statement about the chloroplast is INCORRECT?

  • (a) The Calvin cycle enzymes are attached to the inner side of the thylakoid membrane. Correct
  • (b) NADP reductase faces the stroma side of the membrane. Your answer
  • (c) The thylakoid membranes contain the photosynthetic pigments. Your answer
  • (d) Protons accumulate in the lumen of the thylakoids during the light reaction. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Statement (a) is incorrect: the Calvin cycle enzymes are in the stroma, not attached to the inner side of the thylakoid membrane. The other statements are correct.

Why the other options are wrong

  • (b) · your answer Correct: NADP reductase faces the stroma.
  • (c) · your answer Correct: the pigments are in the thylakoid membranes.
  • (d) · your answer Correct: protons collect in the lumen.
NCERT point: The stroma is the site of the enzymatic reactions.
What is wrong?
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