Which one of the following regions of atmosphere contains ozone?

Troposphere

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Thermosphere

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Mesosphere

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Stratosphere

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Solution

The correct option is D Stratosphere
The upper stratosphere consists of considerable amount of ozone ( $O_{3}$ ), which protects us from the harmful ultraviolet (UV) radiations (255 nm) coming from the sun. These radiations cause skin cancer (melanoma) in humans. Therefore, it is important to maintain the ozone shield.

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