A) Most of the forests have been lost in tropical areas
B) Ozone in upper part of atmosphere is harmful to animals
C) Greenhouse effect is a natural phenomenon
D) Eutrophication is a natural phenomenon in freshwater bodies
Correct Answer: B
Solution :
Ozone \[({{O}_{3}})\]is an isotope of oxygen which exists in so called ozone layer at a height of about 15-60 km in the middle and upper stratosphere and lower mesosphere. This ozone layer absorbs UV-rays of longer wavelength and protects life on Earth from damaging effects of these radiations. Ozone in the lower atmosphere (troposphere) is regarded as a pollutant.
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