Question

Which is the primary $C{O}_2$ acceptor for $C_3$ plant $and{C}_4$ plant.

Answer 1

The C3 cycle is a cyclic process of reduction of carbon dioxide in which the first stable product is a three-carbon compound which is 3-phosphoglyceric acid or 3 PGA. In the cycle the carbon dioxide acceptor molecule is RuBP and the enzyme catalyzing this reaction is RuBP carboxylase. The plants in which this way of carbon dioxide reduction occurs are known as C3 plants point The C4 plants are the ones in which the carbon reduction leads to the formation of a stable product which is a four-carbon compound oxaloacetic acid instead of a three carbon atom compound. The stable product in C4 plant is dicarboxylic substance. Hence it is also called dicarboxylic acid cycle. The primary acceptor of carbon dioxide molecule is phosphoenolpyruvic acid which is present in the chloroplast of mesophyll cells.