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Which gas is present in less than about one percent of the atmosphere and is important for photosynthesis and the greenhouse effect?

Answer and explanation

Correct answer: Carbon dioxide

Direct answer: B, carbon dioxide. Carbon dioxide is present in a very small proportion of the atmosphere, well below 1% in the usual school-level description. Even at this low concentration, it is important in two different ways. Green plants take in carbon dioxide as a raw material for photosynthesis, and the gas absorbs some outgoing infrared radiation, contributing to the natural greenhouse effect. Option A is wrong because nitrogen is the most abundant gas, about 78%. Option C is wrong because oxygen forms about 21%, not less than 1%. Option D is wrong because both nitrogen and oxygen are major gases, not trace gases. The useful warning is that a gas may be small in quantity but large in importance; concentration and function are not the same thing.

Related tags

Carbon DioxidePhotosynthesisGreenhouse EffectAtmospheric GasesCovers GaapTheory Base Of AccountingAccountancyClass 11 Mcq

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