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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
cellular respiration, or cellular metabolism, is often used by the heterotrophs (or consumers, in layman's term) to produce ATP (Adenosine Triphosphate) and other elements for the yielding of energy.. photosynthesis is used by autotrophs or producers, mainly plants, to produce their own food (also their energy source), which are also consumed by many heterotrophs..