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To make one molecule of sucrose (12 carbons), the Calvin cycle must turn

  • (a) 24 times Your answer
  • (b) 6 times Your answer
  • (c) 18 times Your answer
  • (d) 12 times Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Each turn fixes one carbon, so a 12-carbon sucrose needs 12 turns.

Why the other options are wrong

  • (a) · your answer 24 turns would fix 24 carbons.
  • (b) · your answer 6 turns make one glucose (6C), not sucrose.
  • (c) · your answer 18 turns would fix 18 carbons.
NCERT point: One turn = one CO2 fixed.
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