18. NCERT Exemplar IX

 

(a). When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________.
(air pollution, harmful, living, unwanted, non-living, pollutants).

(b). 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).

(c). While ________ your teeth, leaving the ________ running may waste several ________ of water.
(tap, litres, brushing, washing, drops)

(d). Water which is suitable for _________ is called ________ water.
(washing, bathing, drinking, potable, soft).

(e). Water which looks clean still has disease carrying ________ and ________ impurities.
(insects, microorganism, particles, dissolved, harmful).