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In Hatch and Slack pathway, the primary CO2 acceptor is

1. Rubisco
2. Oxaloacetic acid
3. Phosphoglyceric acid
4. Phosphoenol pyruvate

Correct answer: Phosphoenol pyruvate

Solution

In the Hatch and Slack (C4) pathway, CO2 is first fixed by PEP carboxylase, which uses phosphoenol pyruvate as the primary CO2 acceptor. Rubisco and phosphoglyceric acid belong to the Calvin cycle, while oxaloacetic acid is the first stable product after CO2 fixation.

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