Question

Which of the following is the result of the use of chlorofluorocarbons?
A. Global warming
B. Eutrophication of lakes
C. Depletion of the Ozone layer
D. Magnification in the food chain
E. Acid rain.

Answer 1

Chlorofluorocarbon is the non-toxic, nonflammable chemical compound that is composed of carbon along with halons like fluorine and chlorine. They are used in refrigerants, aerosol sprays, as solvents, blowing agents for the foams, and packaging materials.

Complete answer:
CFCs is Chlorofluorocarbon which is mainly responsible for the destruction of the stratospheric ozone layer which creates an ozone hole. The ozone layer is a protective layer around the earth that captures the harmful UV radiation and acts as a barrier, making life possible on earth. The ozone layer is formed by three oxygen molecules at high temperatures by capturing the short wave radiations like UV.
A. Global warming is caused by greenhouse gases like methane, carbon dioxide, water vapors, nitrous oxide, and fluorinated gases. Such greenhouse gases raise the average mean temperature of the earth, which causes a change in climate, ocean acidification, melting of glaciers, and many more such incidents.
B. Eutrophication of lakes:- It is the death of a water body it can be natural or manmade, the eutrophication is caused by the accumulation of biomass in the water body which increases the microbial activity at the bottom of the lake that decreases the dissolved oxygen which affects the aquatic life.
D. Magnification in the food chain is also called biomagnification, in which the accumulation of toxic substance takes place in lower trophic level of the food chain, that leads to an increase in the concentration of that toxic substance in a high level of the food chain, that threaten the food chain eg- accumulation of DDT in birds eggshell.
E. Acid rain is caused by the oxides of nitrogen and oxides of Sulphur which are emitted from the burning of fossil fuel such as coal and petroleum, oxides of nitrogen and Sulphur are also responsible for the smog formation.
Hence, the correct option is C.

Note: Several kinds of conventions and protocols are implemented by UNEP to protect the ozone such Montreal protocol to protect the ozone from the ozone-depleting substance like CFC’s by replacing the CFCs with other alternatives.