Q15 / 180 · AIIMS 2010 · Botany

The first stable product of Calvin cycle is

  • Correct answer
    A
    3-phosphoglycerate
  • B
    1, 3 biphosphoglycerate
  • C
    glyceraldehyde - 3 phosphate
  • D
    ribulose - 5-phosphate.

Solution

Calvin pathway occurs in all photosynthetic plants which is $\mathrm{CO}_2$ fixation cycle. Carbon dioxide combines with ribulose-1, 5-biphosphate (RuBp) to produce a transient intermediate compound. The intermediate compound splits up immediately in the presence of water to form the two molecules of 3-phosphoglycerate or 3-PGA. It is the first stable product of photosynthesis.

Hence, the correct answer is option: 'A'.

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