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The light-independent reactions of photosynthesis are chemical reactions that convert carbon dioxide and other compounds into glucose. These reactions occur in the stroma, the fluid-filled area of a chloroplast outside of the thylakoid membranes. These reactions take the products (ATP and NADPH) of light-dependent reactions and perform further chemical processes on them. There are three phases to the light-independent reactions, collectively called the Calvin cycle: carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration.
In the process, the oxygen atom in the water separates from the hydrogen atoms and passes out as waste. The remaining hydrogen is collected and eventually synthesized into a carbohydrate molecule. The process that creates the actual food for the plant does not require light, so it's called a dark reaction. In another part of the leaf called the stroma, carbon dioxide that's been absorbed from the environment is reduced into carbon and oxygen.