Which one of the following is a wrong statement?

Options

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

Answer

B

Explanation

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 (troposhpere) is regarded as pollutant.