Water, carbon dioxide, NADPH and ATP produced in light reactions are reactants needed in the Calvin cycle to take place.
The Calvin cycle generates the reactions necessary for carbon fixation using the energy of ATP and NADPH produced in the light reactions.
- The cycle uses six molecules of CO2 to obtain one of glucose, attaching them to various receptors in a repetitive circuit of energy-consuming chemical reactions (ATP).
- Six turns of the cycle are necessary to compose a glucose molecule, at each complete turn of the cycle, a carbon dioxide molecule enters the cycle and is reduced, presenting regeneration of a RuBP molecule.
Therefore, we can conclude that energy (ATP and NADPH), obtained in the light phase, is used for carbon fixation in photosynthesis.
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