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Plants need sugar not only for energy but also for synthesizing essential metabolites and building blocks including cellulose (used in cell wall), glycoproteins and 5-carbon sugars for nucleotides. As already mentioned by canadianer, plants respire by oxidizing sugars. This happens mostly during the night. However photosynthesis also produces ATP and ...


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Oxygen in photosynthesis does not come from carbon dioxide. It comes from water and this is the step that actually requires light: Photolysis of water. The proton produced in this process is used to synthesize ATP and NADPH by a chemiosmotic process similar to what happens in mitochondria. These biochemical pathways are also referred to as Light reactions. ...



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