Optometry Admission Test (OAT) 2025 – 400 Free Practice Questions to Pass the Exam

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Which cycle is primarily responsible for fixing carbon during photosynthesis?

Krebs cycle

Calvin cycle

The Calvin cycle is the process that primarily fixes carbon during photosynthesis. This cycle takes place in the stroma of chloroplasts and involves the conversion of carbon dioxide from the atmosphere into organic compounds that can be used by plants. During the Calvin cycle, carbon dioxide is incorporated into a five-carbon sugar molecule, ribulose bisphosphate (RuBP), through the action of the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO). This process ultimately leads to the production of glucose and other carbohydrates.

The purpose of the Calvin cycle is to transform inorganic carbon dioxide into organic biomass, which is essential for plant growth and energy storage. This cycle does not directly depend on light but is driven by the energy produced during the light reactions of photosynthesis, which generate ATP and NADPH.

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Light reactions

Dark reactions

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