Q45 / 200 · NEET 2012 (Screening) · Botany

Which one of the following is a wrong statement?

  • A
    Most of the forests have been lost in tropical areas
  • Correct answer
    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

Solution

Ozone $\left(\mathrm{O}_3\right)$ is an isotope of oxygen which exists in so called ozone layer at a height of about $15-60 \mathrm{~km}$ 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.

Hence, the correct answer is option: 'B'.

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