Question

Which of the following is concerned with carbon dioxide fixation?

• A. Krebs' cycle
• B. Calvin cycle
• C. Orhithine cycle
• D. Glycolysis

Answer 1

The correct option is B Calvin cycle

When carbon dioxide is reduced to simple organic compound, then it is called carbon dioxide fixation. Melvin Calvin helped to mark out the complete biosynthetic pathway; hence it is called as Calvin cycle. The first stable product identified was 3-phosphogyceric acid (PGA), hence it is also named as $C_3$ pathway. Calvin cycle occurs in all photosynthetic plants whether they have $C_3$ or $C_4$ pathway. Calvin cycle occurs in three stages: - carboxylation, reduction, and regeneration.