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Photorespiration in C3 plants starts from

  • (a) phosphoglycerate Your answer
  • (b) glycerate Your answer
  • (c) phosphoglycolate Correct
  • (d) glycine Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Photorespiration starts when RuBisCO oxygenates RuBP, forming phosphoglycolate (2-carbon) and PGA. Phosphoglycolate is the starting compound of the photorespiratory pathway.

Why the other options are wrong

  • (a) · your answer Phosphoglycerate (PGA) is formed alongside, but it enters the Calvin cycle; the pathway starts from phosphoglycolate.
  • (b) · your answer Glycerate is formed near the end of the pathway, not at the start.
  • (d) · your answer Glycine is formed in the peroxisome, later in the pathway.
NCERT point: RuBP + O2 → phosphoglycerate + phosphoglycolate. The pathway that follows releases CO2 without making sugar or ATP.
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