Q2 of 23 Page 198

Match the items in column I with the closely related ones in column II.































Column I



Column II



(i) Chlorofluocarbons (CFCs)



(a) Global warming



(ii) Flysh



(b) Biodegradable



(iii) Cow dung



(c) Nuclear radiation pollutant



(iv) CO2 and methane



(d) Acid rain



(v) Sulphur dioxide



(e) Industrial waste



(vi) Iodine – 131



(f) Ozone depletion








































Column I





Column II





Explanation




(i) Chlorofluorocarbons (CFCs)



(f) Ozone depletion



CFCs release halogen atoms on reaching the stratosphere. The atoms initiate the breakdown of ozone into oxygen.



(ii) Fly ash



(e) Industrial waste



Fly ash is the product that is formed by burning coal. Coal is used as fuel in industries.





(iii) Cow dung



(b) Biodegradable



Cow dung can be easily broken down by natural agents and causes no pollution.



(iv) CO2 and methane



(a) Global warming



CO2 and methane lead to greenhouse effect which in turn contributes to global warming.



(v) Sulphur dioxide



(d) Acid rain



When sulphur dioxide comes in contact with moisture in the atmosphere, it combines with it to form sulphuric acid. This pours down in the form of acid rain.



(vi) Iodine – 131



(c) Nuclear radiation pollutant



Iodine 131 is a radioisotope of Iodine. High levels of intake lead to malfunctioning of the thyroid gland.




More from this chapter

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3

One of the examples of radiation pollutants is

 1

Name the following pollutants :

(i) A pollutant which is mainly responsible for causing acid rain


(ii) Any two chemicals leading to the formation of ozone holes.


(iii) The chemical element which caused Minamata disease in Japan.

 3

Fill in the blanks:

(i) Rubber particles and dust raised by running motor vehicles are examples of .................... pollutants.


(ii) Too frequent exposure to.................... in a medical diagnostic technique may damage chromosomes.


(iii) Thermal power plants give out a lot of .................... waste water.


(iv) Sewage is a liquid waste from………

 1

List two major harmful effects of each of the following:

(i) Rivers contaminated with sewage.


(ii) Too much gaseous exhausts containing CO2 and SO2.


(iii) Pesticides such as DDT used in agriculture.


(iv) Prolonged noise such as the one produced by crackers throughout the night.