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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.
In cell respiration, the chemical energy in sugar is transferred to ATP. In the process, some of its chemical energy is changed to heat. As with photosynthesis, the amount of energy that enters the system in the chemical bonds of sugar equals the amount transferred to ATP plus the amount changed to heat. The second law of thermodynamics applies to cell respiration too. Heat is a very low-quality form of energy compared to chemical energy.