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Without the presence of atmospheric oxygen, which process would be severely affected?

Answer and explanation

Correct answer: Aerobic respiration

Direct answer: A, aerobic respiration. In aerobic respiration, cells use oxygen to help release usable energy from food. Oxygen acts as the final acceptor in the energy-releasing chain inside many cells, allowing efficient production of energy for movement, growth, repair, and other life functions. If atmospheric oxygen were absent, organisms that depend on aerobic respiration would be seriously affected, although some organisms can use anaerobic pathways. Option B is wrong because light scattering mainly depends on interactions with molecules and particles and does not require oxygen specifically. Option C is wrong because argon’s chemical inertness is a property of argon, not a process that requires atmospheric oxygen. Option D is wrong because neon’s rarity is related to its abundance and distribution, not to oxygen availability. Memory cue: aerobic means “with oxygen,” so oxygen loss directly threatens aerobic respiration.

Related tags

OxygenAerobic RespirationAtmosphereLife ProcessesMeaning & DefinitionMeaning DefinitionIntroduction To AccountingAccountancy

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