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The oxygenation activity of RuBisCO in photorespiration leads to the formation of

  • (a) 1 molecule of a 3-C compound Correct
  • (b) 1 molecule of a 6-C compound Your answer
  • (c) 1 molecule of a 4-C compound and 1 molecule of a 2-C compound Your answer
  • (d) 2 molecules of a 3-C compound Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

When RuBisCO acts as an oxygenase, RuBP takes up O2 and splits into one molecule of PGA (a 3-carbon compound) and one molecule of phosphoglycolate (2-carbon). Of the options, one 3-C compound is correct.

Why the other options are wrong

  • (b) · your answer No 6-carbon compound is formed in the oxygenation of RuBP.
  • (c) · your answer No 4-carbon compound is formed; the products are one 3-C and one 2-C compound.
  • (d) · your answer Two molecules of PGA are formed in carboxylation, not oxygenation.
NCERT point: Carboxylation: RuBP + CO2 → 2 PGA. Oxygenation: RuBP + O2 → 1 PGA + 1 phosphoglycolate.
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