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Why is respiration considered different from combustion yet an energy releasing chemical process?

Answer and explanation

Correct answer: Glucose undergoes enzyme-controlled oxidation and energy is released gradually

During respiration, glucose undergoes controlled, stepwise oxidation with the help of enzymes. Energy is released gradually, and a useful portion is captured in ATP; hence, respiration is an energy-releasing chemical process. Combustion also involves oxidation, but energy is released very rapidly, mainly as heat and light. Option C is incorrect because respiration is exothermic, not endothermic. Exam tip: Remember respiration as “slow, controlled oxidation” and combustion as “rapid oxidation.”

Related tags

Class 10 ScienceChemical ReactionsRespirationCombustionOxidationExothermic ReactionAtp

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