Explain the traditional way of purifying water to make it fit for drinking.
We should plant trees and nurture the ones already present in the neighbourhood. Why?
Why is it advised that industries should switch over to cleaner
fuels such as CNG and LPG in the Taj Mahal Zone in Agra?
What do CFCs stand for? Name some devices where CFCs are used. Why CFCs are considered as pollutants?
In the following statements, the underlined words are jumbled
up. Write them in their correct form.
(a) Air contains 78% ginroten and 21% gonexy.
(b) Vehicles produce high level of pollutants like carbon dioxide,
nitrogen oxides, nobrac moondexi and mosek.
(c) Carbon dioxide, thaneme, nitrous oxide and water vapour
are known as heengrouse sesga.
(d) Gangotri glacier in Himalaya has started melting because of
lablog ringwam.
(e) Whenever harmful substances such as wagese, toxic
chemicals, silt, etc. get mixed with water, the water becomes
potdulle.
. Find out the wrong statements and write them in their correct
form.
(a) We can survive for some time without air but we cannot survive
even for a few minutes without food.
(b) A brick kiln emits lot of smoke and other harmful gases
causing air pollution.
(c) Carbon monoxide is produced by complete burning of fuels
such as coal, petrol, diesel.
(d) Chlorination is a commonly used chemical method for killing
germs in water.
(e) Water which is suitable for drinking is called soft water.
Fill in the blanks with the help of words given in bracket after each sentence.
(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).
The level of air pollution is higher at a busy traffic intersection. Why?
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