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Respiration is a pure exothermic reaction because when we exhale there us carbon dioxide along with the residual oxygen and with certain amount of water vapour. No heat energy is provided during inhalation however the energy or heat liberated during oxidation of the food and other activities comes out as heat energy. Since there is heat energy released during respiration the reaction is called to be the exothermic reaction.
They are actually the complete opposite! Photosynthesis is when energy, carbon dioxide and water react to produce glucose and oxygen. It is an endothermic reaction (takes in more energy than it gives off). Respiration is the process of producing energy from glucose. It uses glucose and oxygen to give water, carbon dioxide and energy (this making it exothermic). In plants, they make their own glucose using the suns energy, then respire to allow them to use the glucose for energy they can use.