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In photorespiration, RuBP combines with O2 to form one molecule of phosphoglycerate and one molecule of

  • (a) oxaloacetate Your answer
  • (b) 3-PGA Your answer
  • (c) malate Your answer
  • (d) phosphoglycolate Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

In photorespiration, RuBP + O2 gives one molecule of phosphoglycerate and one of phosphoglycolate (2-carbon).

Why the other options are wrong

  • (a) · your answer Oxaloacetate is formed in C4 fixation, not photorespiration.
  • (b) · your answer Only one PGA is formed; the other product is phosphoglycolate.
  • (c) · your answer Malate is a C4 acid, not a photorespiratory product.
NCERT point: Phosphoglycolate is the starting compound of the photorespiratory pathway.
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