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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.
Definition of RESPIRATION for Kids. 1. : the act or process of breathing: the inhaling of oxygen and the exhaling of carbon dioxide. 2. : the process by which cells use oxygen to break down sugar and obtain energy. the physical and chemical processes (as breathing and diffusion) by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions. 3. : cellular respiration.