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The first reaction of photorespiration is

  • (a) carboxylation Your answer
  • (b) oxygenation Correct
  • (c) phosphorylation Your answer
  • (d) decarboxylation Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Photorespiration begins with the oxygenation of RuBP by RuBisCO: O2 is added instead of CO2.

Why the other options are wrong

  • (a) · your answer Carboxylation is the first step of the Calvin cycle, not of photorespiration.
  • (c) · your answer Phosphorylation is not the starting step.
  • (d) · your answer CO2 is released (decarboxylation) at the end, in the mitochondria.
NCERT point: RuBP + O2 → PGA + phosphoglycolate.
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