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What was the main benefit of the ozone layer for life on Earth?

Answer and explanation

Correct answer: Protection from harmful ultraviolet rays

The ozone layer’s major benefit was absorbing much of the Sun’s harmful ultraviolet, especially UV-B and UV-C, before that radiation reached Earth’s surface. Excess ultraviolet radiation can damage cells and genetic material, so ozone protection helped organisms survive and later diversify on land. Option B is correct because it states this protective function directly. Ozone did not stop rainfall, dry the oceans, or prevent Earth from rotating. Those choices describe unrelated or physically impossible effects. The question focuses on the biological importance of atmospheric evolution, particularly the creation of safer surface conditions for life.

Related tags

Ozone LayerUltraviolet RadiationLife On EarthEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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