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The enzyme which fixes CO2 in C4 plants is

1. Hydrogenase
2. PEP carboxylase
3. Reductase
4. RuBP carboxylase

Correct answer: PEP carboxylase

Solution

PEP carboxylase is the enzyme that initially fixes CO2 in C4 plants by adding it to phosphoenolpyruvate (PEP). RuBP carboxylase (Rubisco) is the main CO2-fixing enzyme of the Calvin cycle in C3 plants, not the first step of C4 fixation.

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