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Simplified photorespiration and Calvin cycle. Photorespiration (also known as the oxidative photosynthetic carbon cycle, or C2 photosynthesis) is a process in plant metabolism which attempts to reduce the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO.
Cellular respiration is the process of breaking down food molecules to obtain energy and store it in the form of adenosine triphosphate (ATP) molecules. Plant cells, after creating sugar molecules through photosynthesis, undergo cellular respiration to create ATP molecules.Animals obtain food molecules from plants and other organisms, and then undergo cellular respiration to obtain ATP molecules. Cellular respiration occurs at all times. â Photosynthesis involves conversion of one type of energy into another: light energy into chemical energy. â Cellular respiration involves using that chemical energy and breaking it down to release energy.