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  4. The primary acceptor, during CO2 fixation in C3 plants, is

Q. The primary acceptor, during CO2 fixation in C3 plants, is

 4610  241 AIPMTAIPMT 1995Photosynthesis in Higher Plants Report Error

Solution:

The Calvin cycle is also known as C3 cycle because CO2, reduction is cyclic process and first stable product in this cycle is a 3-C compound (i.e., 3-phosphoglyceric acid or 3-PGA). In this cycle, CO2 acceptor molecule is RuBP or RuDP (i.e., Ribulose 1, 5-biphosphate or Ribulose 1, 5-diphosphate). There occurs covalent bonding of CO2, to RuBP and the enzyme catalyzing this reaction is RuBP-carboxylase/oxygenase (RuBisCO).