In the upper atmosphere ....... becomes ozone , a substance that protects the earth from UV radiation and makes life on land possible.

Carbondioxide

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Oxygen

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Nitrogen

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Water vapour

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Solution

The correct option is C Oxygen
Ozone is a gas found in the atmosphere consisting of three oxygen atoms: $O_{3}$ . Ozone is formed in the atmosphere when energetic ultraviolet (UV) radiation dissociates molecules of oxygen, $O_{2}$ $ , into separate oxygen atoms. Free oxygen atoms can recombine to form oxygen molecules but if a free oxygen atom collides with an oxygen molecule, it joins up, forming ozone.
So, the correct answer is 'Oxygen'.

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Ozone, which protects the environment from harmful effects of UV radiations from directly falling on earth, is present in which layer?

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