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The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of

1. 1 molecule of 3-C compound
2. 1 molecule of 6-C compound
3. 1 molecule of 4-C compound and 1 molecule of 2-C compound
4. 2 molecules of 3-C compound

Correct answer: 1 molecule of 4-C compound and 1 molecule of 2-C compound

Solution

In photorespiration, RuBisCo’s oxygenase activity acts on RuBP and the unstable 6-carbon intermediate splits into two products. These are one 4-carbon compound and one 2-carbon compound, which is why oxygenation is wasteful compared with carboxylation.

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