Question

Pick up the wrong statement?

• A. Eutrophication is a phenomenon found in freshwater bodies.
• B. Ozone in upper part of atmosphere is harmful to animals.
• C. Most of the forests have been lost in tropical areas.
• D. Greenhouse effect is a natural phenomenon.

Answer 1

The correct option is B Ozone in upper part of atmosphere is harmful to animals.

Good ozone is found in the upper part of the atmosphere, called as the stratosphere, and it acts as a shield absorbing ultraviolet radiation from the sun. UV radiation of wavelengths shorter than UV-B, are almost completely absorbed by earths atmosphere, given that the ozone layer is intact. But, UV-B damages DNA and mutation may occur. It causes aging of skin, damage to skin cells and various types of skin cancers. In human eye, cornea absorbs UV-B radiation, and a high dose of UV-B causes inflammation of cornea. Such exposure may permanently damage the cornea.