(a) Chlorofluorocarbons (CFCs) are added to the stratosphere, which have a permanent and continuing effect on ozone levels. Although ozone depletion is occurring widely in the stratosphere, the depletion is particularly marked over the Antarctic region. This has resulted in the formation of a large area of the ruined ozone layer, commonly called as the ozone ****.
Ozone depletion causes UV radiations to increase about 10%, which results in various **** including skin ** and eye ***.
(b) DDT is insoluble in water but soluble in fats. Due to low efficient transfer of energy from one trophic level to other, herbivores eat more DDT-polluted vegetables. Similarly, carnivores. eat many herbivores. A predator stores, much quantity of DDT with its prey continuously. This Process continues for several years by which more concentration of DDT accumulates in top carnivores.
DDT interferes the eggshell formation in many birds. It causes ***** breaking of eggshells, eventually causing decline in bird populations.
