How does the ozone layer in the atmosphere protect life on earth?
A. By absorbing infrared radiation of the sun.
B. By transmitting heat radiations of the sun.
C. By absorbing ultraviolet radiations of the sun.
D. All of the above.

Hint: As we all know that ultraviolet rays are harmful to human as it can cause severe damage in the skin because when a human's skin is exposed to UV rays, then several issues like sunburn, skin ageing, skin cancer etc. can occur.

Complete step by step answer:
As we know, the Ozone layer is mainly present on the upper portion of the stratosphere. More than ninety per cent of the ozone is present in the stratosphere. From the stratosphere, it captures all the UV radiations coming from the sun and what we get in the earth’s atmosphere is UV free sunlight.
The stratosphere is located around 45 km away from the earth’s surface. Near the earth’s surface ozone is present but only in a minor amount which generally can’t harm humans.
But some carbon emissions by industries and releasing of CFCs are creating a harmful effect on the ozone layer. It was observed that since the 1970s, the ozone layer has started depleting, and now there is a hole in the ozone layer. The ozone layer is mainly hampered near the south pole, and since the majority of humans are living in the equator and near the north pole so, therefore, human life is protected till now.
Therefore, the ozone layer protects human life by absorbing UV radiation, and the correct option is (C).

Note: As we all know that UV rays are harmful to humans, but we must also keep in mind that UV rays harm the human according to the type of skin and the intensity of radiation that a human is exposed. One of the primary chronic diseases caused by UV rays is Photo carcinogenesis.