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Photosystem II occurs in

  • (a) cytochrome Your answer
  • (b) grana Correct
  • (c) mitochondrial surface Your answer
  • (d) stroma Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

PS II is found mainly in the stacked thylakoids of the grana. The stroma lamellae have PS I but lack PS II.

Why the other options are wrong

  • (a) · your answer Cytochromes are electron carriers, not a location; PS II is not inside a cytochrome.
  • (c) · your answer Photosystems are in chloroplasts, not on mitochondria.
  • (d) · your answer The stroma has the Calvin cycle enzymes; photosystems are in the thylakoid membranes.
NCERT point: Grana lamellae have both PS I and PS II; stroma lamellae have PS I only.
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