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To synthesise one glucose molecule, the Calvin cycle operates

  • (a) 6 times Correct
  • (b) 4 times Your answer
  • (c) 8 times Your answer
  • (d) 2 times Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Each turn of the Calvin cycle fixes one CO2. Glucose has 6 carbons, so the cycle must turn 6 times to make one glucose molecule.

Why the other options are wrong

  • (b) · your answer Four turns fix only 4 carbons, not enough for glucose.
  • (c) · your answer Eight turns would fix 8 carbons, more than glucose has.
  • (d) · your answer Two turns fix only 2 carbons.
NCERT point: One turn = one CO2 fixed, using 3 ATP and 2 NADPH.
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