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The enzyme that catalyses carbon dioxide fixation in C4 plants is

1. RuBP carboxylase
2. PEP carboxylase
3. Carbonic anhydrase
4. Carboxy dismutase

Correct answer: PEP carboxylase

Solution

In C4 plants, carbon dioxide is first fixed in mesophyll cells by phosphoenolpyruvate (PEP) carboxylase, which combines CO2 with PEP to form a 4-carbon acid. RuBP carboxylase functions later in the Calvin cycle, mainly in bundle sheath cells.

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