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In photorespiration, instead of two molecules of 3-PGA, RuBP oxygenation gives

  • (a) one OAA and one pyruvate Your answer
  • (b) one phosphoglycerate and one phosphoglycolate Correct
  • (c) two molecules of phosphoglycolate Your answer
  • (d) two molecules of glucose Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

When RuBP is oxygenated, it gives one molecule of phosphoglycerate and one molecule of phosphoglycolate, instead of two PGA.

Why the other options are wrong

  • (a) · your answer OAA and pyruvate belong to the C4 pathway.
  • (c) · your answer Only one phosphoglycolate is formed.
  • (d) · your answer No glucose is formed in photorespiration.
NCERT point: Phosphoglycolate is the starting point of the photorespiratory pathway.
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