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Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel the organisms' activities.arbon dioxide is converted into sugars in a process called carbon fixation. Carbon fixation is an endothermic redox reaction, so photosynthesis needs to supply both a source of energy to drive this process, and the electrons needed to convert carbon dioxide into a carbohydrate.
Organisms that use inorganic sources of energy, and particularly plants are the base unit of stored energy in any ecosystem. Light energy is converted to chemical energy by photosynthesis within the cells of plants. Because all the energy fixed by plants is converted to sugars it is in theory possible to calculate a plantâs energy uptake by measuring the amount of sugar produced. This is Gross Primary Production (GPP), because it occurs in the primary producers, an abstract that is difficult to measure.