Photosynthesis takes place in two stages, referred to as A) light reactions and dark reactions. B) oxygen requiring and oxygen releasing reactions. C) H₂O splitting and sugar synthesizing reactions. D) chlorophyll dependent and independent reactions.

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Photosynthesis occurs in two stages, light-dependent reactions (or light reactions) and light-independent reactions (or dark reactions), which are also called the Calvin cycle. In light reactions, light energy is captured by pigments such as chlorophyll and converted into chemical energy in the form of ATP and NADPH. In dark reactions, carbon dioxide is fixed into organic molecules using the energy from ATP and NADPH produced during light reactions. The terms "light" and "dark" reactions are somewhat misleading, as both stages may occur in light or darkness, but the light reactions require light energy to occur.

Photosynthesis Takes Place in Two Stages, Referred to as