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Why can combustion and respiration be considered similar on the basis of energy?

Answer and explanation

Correct answer: Both processes release energy

In combustion, oxidation of a fuel releases energy as heat and often as light. In respiration, glucose undergoes controlled oxidation and releases energy, which is used to form ATP. Hence, both are energy-releasing, or exothermic, processes. Option B is incorrect because there is no net absorption of energy, and option D is incorrect because respiration does not release energy as light. Exam tip: A reaction with an overall release of energy is identified as exothermic.

Related tags

Class 10 ScienceChemical ReactionsCombustionRespirationExothermic ReactionsEnergy Release

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