Page 143 - Genius Kidz Prudence Learning Sc-8

2. Fill in the blanks.

(a) Photochemical smog causes __________________ .
(b) __________________ and __________________ acids are responsible for acid rain.

(c) __________________ ozone acts as an air pollutant.
(d) Sources of Freons include __________________ .

3. Match the columns.

Column A Column B
(a) Stratospheric ozone (i) Greenhouse gas

(b) Point source (ii) Carbonic acid
(c) Chlorofluorocarbons (iii) Sewage drains

(d) Global warming (iv) Protective umbrella

(e) Normal rain (v) Melting of polar ice.
4. Mark the statements as True /False .

(a) Run off from fields is an example of diffused source of water pollution.
(b) Sulphur dioxide is a greenhouse gas.

(c) Methane is a greenhouse gas.
(d) Underground water pollution can never be prevented.

5. Prepare a short note on “Treatment of waste water”.

6. “Taj Mahal is getting yellowish day-by-day”.Why?
7. Very short answer type questions.

(a) What is global warming ?
(b) What is eutrophication ?

(c) Write the names of major greenhouse gases.
8. Short answer type questions.

(a) “Air pollution can be prevented”. Justify.

(b) “Greenhouse effect is necessary but enhanced greenhouse effect is not good”. Justify.
9. Long answer type questions.

(a) Explain the terms :
(i) Air pollution (ii) Water pollution (iii) Air pollutants

(iv) Photochemical smog (v) Acid rain (vi) Ozone depletion
(vii) Water pollutants (viii) Eutrophication (ix) Causes of water pollution

(b) Write a note on prevention of pollution.

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