Photosynthesis is the process in which green plants utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. Chlorophyll is the green pigment that is located in the grana of chloroplasts, and converts light energy into food in the form of glucose. Chloroplasts are structures in the cells of plants and algae where photosynthesis takes place.(Encarta 2000) Photosynthesis only occurs in autotrophs because they are unable to obtain food, therefore they have to make it themselves. Heterotrophs on the other hand like humans, are motile and can obtain their food so they cannot make their o
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