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The water-splitting complex is located on the

  • (a) outer side of the thylakoid membrane, facing the stroma Your answer
  • (b) outer membrane of the chloroplast Your answer
  • (c) inner side of the thylakoid membrane, facing the lumen Correct
  • (d) stroma lamellae Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The water-splitting complex is on the inner side of the thylakoid membrane, facing the lumen. So the protons from water collect in the lumen.

Why the other options are wrong

  • (a) · your answer It faces the lumen, not the stroma.
  • (b) · your answer The outer membrane of the chloroplast has no photosystems.
  • (d) · your answer Stroma lamellae lack PS II, so they lack the water-splitting complex.
NCERT point: Proton build-up in the lumen drives ATP synthesis.
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