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...Photosynthesis Photosynthesis relates to the process through which green plants and other specific organisms use sunlight in synthesizing carbohydrates from water and carbon dioxide. The process occurs in three imperative stages including harnessing sunlight energy, synthesizing NADPH and ATP using energy harnessed, with the last step being Calvin cycle involving CO2 fixation. Calvin cycle as the last step uses ATP, CO2, NADPH, and ribulose 1, 5-biphosphate to synthesize glyceraldehydes 3-phosphate used in production of sugar and starch through glycolysis (Hurd et. 179). The overall process of photosynthesis occurs through the chemical...