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Why is oxygen essential for life even though it is less abundant than nitrogen?

Answer and explanation

Correct answer: Because it is directly used in respiration

The governing idea is that abundance and biological importance are different measures. Oxygen is directly used by most aerobic organisms in cellular respiration, where food molecules are broken down to release usable energy. Nitrogen is more abundant but is not directly used as the main respiratory gas by humans and most animals. Therefore option A is correct; the other choices misidentify oxygen as inert, dust, or salt.

Related tags

OxygenRespirationLife ProcessesMeaning & DefinitionMeaning DefinitionIntroduction To AccountingAccountancyClass 11 Mcq

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