Pollution of Air and Water Worksheet-7

Pollution of Air and Water Worksheet-7

1. In which part of atmosphere, ozone layer is present?

(a) Stratosphere                           (b) Troposphere

(c) Mesosphere                             (d) Thermosphere

2. There is a possibility of melting of polar ice caps and increase in the level of sea water due to:

(a) depletion of ozone layer        (b) green house effect

(c) acid rain                                   (d) all of these

3. Modes of controlling pollution in large cities include:

(a) less use of insecticides

(b) proper disposal of organic wastes, sewage and industrial effluents

(c) shifting of factories out of the residential area

(d) all of these

4. Among the following, which will NOT help to reduce air pollution?

(a) Burn household rubbish in incinerators

(b) Use catalytic converters on motor vehicles

(c) Fix electric precipitators to factory chimneys

(d) Ban smoking in public places such as in offices

5. Global warming causes:

I – An increase in the sea level

II – The melting of ice at mountain peaks

III – A Decrease in food production by plants

(a) I only                                         (b) I and II only

(c) II and III only                          (d) I, II and III

6. Conserving the environment means:

(a) not destroying natural resources

(b) not lowering the quality of the environment

(c) changing natural resources from its original state

(d) preserving the condition of the nature that has been destroyed

7. Pollution from the burning of fossil fuels can be reduced by:

I – Using an incinerator

II – Using renewable energy

III – Fixing catalytic converters in vehicles

(a) I only                                         (b) II and III only

(c) I and III only                           (d) I, II and III

8. The release of carbon dioxide into the air causes:

(a) acid rain                                   (b) eutrophication

(c) global warming                      (d) respiratory problems

9. Sewage water is purified for recycling by the action of:

(a) fish                                            (b) microorganisms

(c) fuels                                           (d) non-biodegradable chemicals

10. The bioindicators of air pollution are:

(a) algae                                         (b) ferns

(c) mushrooms                             (d) lichens

Answer Key:

(1)-(b); (2)-(b); (3)-(d); (4)-(a); (5)-(d); (6)-(a); (7)-(b); (8)-(c); (9)-(b); (10)-(d)