1. C₄ plants 2. C₂ plants 3. C₃ and C₄ plants 4. C₃ plants

Topic: C3 and C4 pathways, photorespiration· Plant Physiology

Phosphoenol pyruvate (PEP) is the primary CO_2 acceptor in :

1. \(C_4\) plants

2. \(C_2\) plants

3. \(C_3\) and \(C_4\) plants

4. \(C_3\) plants

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Answer: 1. \(C_4\) plants

Key idea: The first \(\mathrm{CO_2}\) acceptor differs in C3 and C4 plants.

In \(\mathrm{C_4}\) plants, phosphoenol pyruvate (PEP) in the mesophyll cells fixes \(\mathrm{CO_2}\) to form oxaloacetic acid (OAA). In \(\mathrm{C_3}\) plants, the acceptor is RuBP. Answer: (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Phosphoenol pyruvate (PEP) is the primary CO_2 acceptor in :

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