Three Stages of Calvin Cycle — NEET Biology
✅ Asked in NEET 2025For ease of understanding, the Calvin cycle can be described under three stages: carboxylation, reduction and regeneration.
The Calvin cycle has three distinct stages: carboxylation (CO₂ fixation via RuBisCO), reduction (using ATP and NADPH to form G3P), and regeneration (regenerating RuBP to restart the cycle). Students often confuse the order of stages or mix them with light reactions, leading to incorrect answers. They may also forget that carboxylation is the first committed step where CO₂ actually enters organic molecules. Remember: carboxylation fixes CO₂, reduction builds sugars using energy, regeneration maintains the cycle's continuity. This three-step framework is fundamental to understanding photosynthetic efficiency and is repeatedly tested in NEET because it directly connects light reactions to carbon fixation outcomes.
This paragraph was tested 2 times in NEET.
NEET 2025: Identify the correct sequence of events in the Calvin cycle:
Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option:
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