Question
Biology Question on Environmental Issues
Which one of the following is a wrong statement
A
Greenhouse effect is a natural Phenomenon
B
Eutrophication is a natural phenomenon in freshwater bodies
C
Most of the forests have been lost in tropical areas
D
Ozone in upper part of atmosphere is harmful to animals
Answer
Ozone in upper part of atmosphere is harmful to animals
Explanation
Solution
Ozone (O) 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.