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If photosynthesis did not increase oxygen which stage in Earth's evolution would be most delayed?

Answer and explanation

Correct answer: Ozone layer and suitability for complex life

The governing concept is the atmospheric significance of oxygen-producing photosynthesis. Photosynthetic organisms gradually added free oxygen to the atmosphere. Oxygen made the formation of an ozone layer possible, and ozone absorbed much harmful ultraviolet radiation. This protection improved conditions at or near the land surface and supported the later diversification of larger and more complex organisms. Therefore option A is correct: without oxygen production, both ozone protection and the expansion of complex life would have been delayed. Core formation and planetesimal accretion occurred much earlier through planetary formation processes, while the first atmosphere also preceded biological oxygen enrichment.

Related tags

PhotosynthesisOxygenOzone LayerEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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