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  4. The first carbon dioxide acceptor in C4-plants is

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Q. The first carbon dioxide acceptor in C4-plants is

AIPMTAIPMT 1990Photosynthesis in Higher Plants

Solution:

The primary acceptor of CO2, is a 3 carbon compound phosphoenol pyruvic acid. Addition of CO2, to any compound is called carboxylation. In C4 cycle, CO2, combines with phosphoenol pyruvic acid to form oxaloacetic acid. The enzyme is phosphoenol pyruvate carboxylase (PEPCo). The oxaloacetic acid breaks up into pyruvic acid and CO2, which combines with RUDP to form PGA as in Calvin cycle.