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entity > process > biological process > photosynthesis

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  • [Henderson's] n. (1) the use of light energy to power biosynthesis in living organisms; (2) in green plants, algae and cyanobacteria, it is the synthesis of carbo­hydrate from carbon dioxide as a carbon source and water as a hydrogen donor with the release of oxygen as a waste product, using light energy trapped by the green pigment chlorophyll. The primary prod­ucts are ATP and NADPH, formed in the presence of light. These are then used in carbohydrate synthesis (the dark reaction). In green plants and algae, photosynthesis takes place in chloroplasts; (3) a similar process in other bacteria, but using hydro­gen donors other than water and produc­ing waste products other than oxygen. a. photosynthetic. see also bacterioch­lorophyll, Calvin cycle, chlorophyll, photo­phosphorylation, photosystem I and II, reaction centre.

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