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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.
1 This releases a small amount of energy. 2  These molecules then move into the mitochondria. 3  At the same time, oxygen enters the cell and travels into the mitochondria. 4  As the smaller molecules are broken down even further, hydrogen is released in a way that allows cells to capture energy in a usable form.ermentation. Fermentation is the process by which cells release energy without oxygen. Recall that in cellular respiration the cell first breaks glucose into smaller molecules. This releases a small amount of energy. Without oxygen, cellular respiration cannot continue.