Explain the Calvin Cycle or C3 Cycle.

1.	Explain the Calvin Cycle or C3 Cycle.
Answer» Discovered by Melvin Calvin, hence called calvin cycle. First stable product is 3-carbon compound hence called C₃ cycle and plants having this pathway of CO₂ fixation are called as C₃ plants. It occurs in following three steps a. Carboxylation, in which CO₂ combines with primary acceptor called RUBP (ribulose 1,5 bisphosphate) in the presence of enzyme RUBISCO (Ribulose, 1.5 bisphosphate carboxylase oxygenase) to produce two molecules of PGA (Phosphoglyceric acid). b. Reduction, in which 2 molecules of PGA get reduced to 2 molecules of PGAL (Phosphoglyceraldehyde, triose sugar) using 2ATP and 2 NADPH. c. Regeneration, in which again primary acceptor (RUBP) is synthesized from PGAL & ATP.

Answer»

Discovered by Melvin Calvin, hence called calvin cycle.

First stable product is 3-carbon compound hence called C₃ cycle and plants having this pathway of CO₂ fixation are called as C₃ plants.

It occurs in following three steps

a. Carboxylation, in which CO₂ combines with primary acceptor called RUBP (ribulose 1,5 bisphosphate) in the presence of enzyme RUBISCO (Ribulose, 1.5 bisphosphate carboxylase oxygenase) to produce two molecules of PGA (Phosphoglyceric acid).

b. Reduction, in which 2 molecules of PGA get reduced to 2 molecules of PGAL (Phosphoglyceraldehyde, triose sugar) using 2ATP and 2 NADPH.

c. Regeneration, in which again primary acceptor (RUBP) is synthesized from PGAL & ATP.

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