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Respiration in Plants BIOLOGY 263 Notes MODULE - 2 Forms and Functions of 12.1 RESPIRATION Plants and animals Respiration is the stepwise oxidation of complex organic molecules and release of energy as ATP for various cellular metabolic activities. It involves exchange of gases between the organism and the external environment. The green as well as non-green
Photo: Ralph Hockens (Flickr). During the night, plants consume oxygen but they don't release any. All plants and animals on earth engage in a process called respiration. Respiration combines oxygen and the food created during photosynthesis to produce usable energy. One of the byproducts of respiration is carbon dioxide.