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If oceans formed but life did not emerge which long term biological effect on atmosphere would be absent?

Answer and explanation

Correct answer: Oxygen increase by photosynthesis

The governing concept is the biological transformation of an initially non-biological atmosphere. Oceans could dissolve gases, condense water vapour and collect rainfall through physical processes even if no organisms existed. However, a major long-term biological change requires photosynthetic organisms. They use light, water and carbon dioxide to make organic matter and release oxygen. Over geological time, this process increased atmospheric oxygen and altered the chemical character of the atmosphere, eventually supporting more complex forms of life. Therefore option A is correct. Options B, C and D describe physical or hydrological processes that could occur without life, so they do not represent the missing biological effect.

Related tags

PhotosynthesisAtmospheric OxygenOcean EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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