The Calvin Cycle is additionally called the C3 cycle or light-independent or dark reaction of photosynthesis. The various stages of the Calvin Cycle or C3 cycle are carbon fixation, reduction, and regeneration. CO2 binds to RuBP in the key method referred to as carbon fixation, forming two-three carbon molecules of phosphoglycerate. Reduction is the second stage of the Calvin cycle. The 3-PGA molecules created through carbon fixation are converted into molecules of simple sugar – glucose. Regeneration is the third stage of the Calvin cycle and could be an advanced process that needs ATP.