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The three stages of the Calvin cycle are

  • (a) fixation, decarboxylation, transport Your answer
  • (b) photolysis, phosphorylation, reduction Your answer
  • (c) carboxylation, reduction, regeneration Correct
  • (d) glycolysis, oxidation, reduction Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The Calvin cycle has three stages: carboxylation (CO2 fixed to RuBP), reduction (PGA to triose phosphate) and regeneration (RuBP formed again).

Why the other options are wrong

  • (a) · your answer Decarboxylation and transport are steps of the C4 pathway, not the Calvin cycle.
  • (b) · your answer Photolysis and phosphorylation are light reactions.
  • (d) · your answer Glycolysis is part of respiration.
NCERT point: The cycle must turn six times to make one glucose.
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The enzyme that carboxylates RuBP is The Calvin cycle occurs in Carboxylation of one molecule of RuBP produces