Question

Calvin cycle represents the phenomenon of:

• A. Oxidative Carboxylation
• B. Substrate Level Phosphorylation
• C. Dark Respiration
• D. Reductive Carboxylation

Hint:

The Calvin cycle is also called C3 pathway since the first stable product is 3-carbon PGA.

Answer 1

The Correct Option is D

Calvin cycle fixes CO$_2$ through reductive carboxylation
Key steps:
Carboxylation: RuBP + CO$_2$ → 2 PGA
Reduction: PGA → G3P using NADPH and ATP
Regeneration: RuBP reformed
Process is reductive (consumes NADPH) and carboxylating