Question

The ozone layer is a layer of the earth,s atmosphere in which most of the atmosphere's ozone is concentrated. It protects the earth from harmful radiation like high energy U-V radiations from passing through it. protective role of the ozone layer in the upper atmosphere is so vital that scientists believe life on earth probably would not have evolved and could not exist today without it. In 1970's, scientist discovered that chemicals known as chlorofluorocarbons (CFCs) can reach the stratosphere and destroy the ozone gas. In 1985, scientist discovered that every year the ozone layer over Antarctica becomes drastically thinner during southern hemisphere spring, which forms a 'Ozone hole' over Antarctica. 

(i) Name any four appliances which release chlorofluorocarbons in the atmosphere.

(ii) 'Damage to the ozone layer is a cause for concern'. Justify this statement. Suggest any three steps to limit this damage.

Answer 1

(i) Four appliances which releases Chlorofluorocarbon are :

(a) Aerosol spray

(b) Air conditioner

(c) Refrigerator

(d) Coolant

(ii) Exposure to U-V rays can lead to greater incidence of skin cancer, cataracts or other damages to the eye and immune deficiency.

Three steps to limit this damage are :

(a) Stop the release of Chlorofluorocarbon

(b) Removing the pollutant nitrogen monoxide

(c) Reduce the usage of air conditioners