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Consider the following statements about the Calvin cycle.
(A) It needs 3 ATP and 2 NADPH for each CO2 fixed.
(B) Its first stable product is a 4-carbon acid.
(C) The CO2 acceptor is a 5-carbon sugar.
(D) It takes place in the thylakoid lumen.
Which statements are correct?

  • (a) A and C only Correct
  • (b) A, C and D only Your answer
  • (c) B and D only Your answer
  • (d) A and B only Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

A (3 ATP + 2 NADPH per CO2) and C (the acceptor is a 5-carbon sugar) are correct. B is wrong: the first product is 3-carbon PGA. D is wrong: the cycle is in the stroma.

Why the other options are wrong

  • (b) · your answer D is wrong.
  • (c) · your answer Both B and D are wrong.
  • (d) · your answer B is wrong.
NCERT point: Calvin cycle: stroma; first product PGA.
What is wrong?
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