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The first carbon dioxide acceptor in C4-plants is

1. Phosphoenol-pyruvate
2. Ribulose 1, 5-diphosphate
3. Oxalo-acetic acid
4. Phosphoglyceric acid

Correct answer: Phosphoenol-pyruvate

Solution

In C4 plants, CO2 is first accepted by phosphoenolpyruvate (PEP) via the enzyme PEP carboxylase. This produces oxaloacetic acid as the first stable product, while RuBP is the CO2 acceptor in C3 plants.

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