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NEET2015BotanyPhotosynthesis in Higher PlantsActual

The first carbon dioxide fixation product of C₄ plants is

Options

  1. Aoxaloacetic acid
  2. Bribulose biphosphate
  3. Cphosphoenol pyruvate
  4. Dphosphoglyceric acid.

Correct answer

A. oxaloacetic acid

Step-by-step solution

In C ₄ plants, initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of CO ₂ i.e., phosphoenol pyruvate (PEP) combines with CO ₂ in the presence of PEP carboxylase or PEPcase to form oxaloacetic acid, which is the first stable carbon dioxide fixation product in C ₄ pathway.

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