Respiration is considered as an exothermic reaction because in respiration oxidation of glucose takes place which produces large amount of heat energy..

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Respiration is an exothermic process because it releases large amounts of energy to the surroundings. During respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as carbon dioxide and water. The overall reaction is------------> C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
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