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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.
Light dependent Reactions. Light dependent reactions occur in the thylakoid membrane of the chloroplasts and take place only when light is available. During these reactions light energy is converted to chemical energy. 1  Chlorophyll and other pigments absorb energy from sunlight.2  Water is used to provide electrons and hydrogen ions but also produces oxygen. 3  The electrons and hydrogen ions are used to create ATP and NADPH.etâs take a look at how these are collected by plants. 1  Carbon dioxide from the air passes through small pores (holes) in the leaves. 2  Water is absorbed by the roots and passes through vessels in the stem on its way to the leaves. 3  Sunlight is absorbed by a green chemical in the leaves.