Q20 of 32 Page 106

The level of air pollution is higher at a busy traffic intersection. Why?

The level of air pollution is higher at a busy traffic intersection because a large number of cars, buses and other automobiles stop there at multiple times throughout the day. Their automobiles release a large amount of gases that contain the various pollution causing gases. The SPM given out by them gets suspended in the air around that area making it polluted.


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18

Name any two water pollutants which are toxic for both plants and animals.

 19

A lot of dry leaves are collected in a school garden and burnt every day. Do you think that it is right to do so? If not, what should we do to dispose off the dry leaves?

 21

Fill in the blanks with the help of words given in the bracket after each sentence.

(1) When air is contaminated by ________ substances which have a ________ effect on both the ________ and _______, it is referred to as ________.


(2) Many _______ are responsible for causing ________ pollution. Petroleum ________ are a major source of _______ pollutants like _______ and ________.


(Sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air ).


(3) While ________ your teeth, leaving the ______ running may waste several ______ of water.


(tap, litres, brushing, washing, drops ).


(4) Water which is suitable for _______ is called _______ water.


(washing, bathing, drinking, potable, soft).


(5) Water which looks clean still has disease carrying _______ and _______ impurities.


(insects, micro organism, particles, dissolved, harmful).


 22

Match the items of Column A with those of Column B. Table