The reaction that is responsible for the primary fixation of $\mathrm{CO}_{2}$ is catalysed by\

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Professor PC Thomas Classes · Answer

(c): Carboxylation is the addition of carbon dioxide to an acceptor. Photosynthetic carboxylation requires ribulose-1, 5-biphosphate or RuBP as acceptor of carbon dioxide and RuBPcarboxylase oxygenase as enzyme in $\mathrm{C}_{3}$ plants. In $\mathrm{C}_{4}$ plants, initial fixation of $\mathrm{CO}_{2}$ occurs in mesophyll cells. The primary acceptor of $\mathrm{CO}_{2}$ is phosphoenol pyruvate which combines with $\mathrm{CO}_{2}$ in presence of PEP carboxylase to form oxaloacetic acid or oxaloacetate.\