GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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hole in ozone layer
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decrease in the ozone layer in troposphere
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decrease in thickness of ozone layer in stratosphere
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increase in the thickness of ozone layer in troposphere
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Detailed explanation-1: -The ozone hole is the place where the thickness of the ozone layer is very thin and the concentration is less than 220 DU. It is seen over Antarctica due to the process of polar vortex and formation of polar stratospheric clouds. Hence, the correct answer is ‘Reduction in thickness of the ozone layer in stratosphere’.
Detailed explanation-2: -The ozone layer in our upper atmosphere provides a filter for ultraviolet radiation, which can be harmful to our health. Researchers found that the ozone layer was thinning, due to emissions into the atmosphere of chlorofluorocarbons (CFCs), halons and bromides.
Detailed explanation-3: -Decrease in thickness of ozone layer in stratosphere : Ozone holes can be given name to the depletion of the ozone layer which is present in the upper atmosphere i.e. stratosphere at the polar region of earth. Thus this option is correct.