Q3 of 95 Page 433

Efforts are being made for substituting the chemicals like CFCs. Why?

CFCs are chlorofluorocarbons are the synthetic chemicals which are made by humans artificially, that means they are not the natural products. Excessive use of these CFCs in refrigerators, ACs, fire-extinguishers, etc. causes the depletion of ozone layer. Because then UV radiations will reach the earth’s surface destructing the survival of plants and organisms.


More from this chapter

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1

Ozone present in the atmosphere is very important for sustenance of life on earth. Justify.

 2

The ultraviolet radiations are damaging to living components of the environment. Give a reason.

 4

Name the process in which wastes are burned at high temperature.

 5

Untreated sewage being disposed of in waste bodies to lead to water pollution. Suggest the practices that can be included for better disposal of sewage waste.