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Why can photosynthesis be called a biological revolution in the Earth system?

Answer and explanation

Correct answer: It began a major change in atmospheric oxygen through living organisms

The governing concept is the biosphere’s ability to transform the wider Earth system. Photosynthetic organisms use light energy to convert carbon dioxide and water into organic matter and release oxygen as a by-product. Over long geological periods, this process substantially increased atmospheric oxygen and supported the development of oxygen-dependent life, while also influencing the carbon cycle and climate. Option C is correct because it identifies the major atmospheric change initiated by living organisms. Photosynthesis did not solidify the metallic core, remove all salt from oceans, or produce the solar wind. Those alternatives confuse biological activity with geological, chemical, or solar processes.

Related tags

Earth-EvolutionPhotosynthesisAtmospheric-OxygenEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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