Pollution of Air & Water

Pollution of air and water Worksheet-7

Short Question:

1. What name is given to unwanted substances present in the air? What is smog?

2. What harm is caused by the presence of CFCs?

3. Discuss possible reasons of acid rain.

4. Name some greenhouse gases? What is rain mixed with sulphuric acid called?

5. Name three diseases caused by polluted water.

6. How is suspended particulate matter harmful?

7. Why has the Gangotri glacier in the Himalayas started melting?

8. How does Ganga River get polluted?

Pollution of air and water Worksheet-8

Comprehension based Questions:

Chemical and pathogenic pollution pose grave risk to human health and all life forms. Waterborne diseases are quite common nowadays. Excessive nutrients from sewage and fertilizers, for example, cause excessive growth of weeds that harms population of aquatic life forms and navigation. This is called Eutrophication. Presence of certain chemicals and minerals like mercury and lead can cause serious disorders and deformities in human beings and animals. Radioactive pollution also does so. Such chemicals generally come through industrial wastes. Thermal pollution raises temperature of water. Some life forms are highly susceptible to even slight increase in temperature. So rise in temperature can even wipe out some species. Ships and oil tankers accidentally cause oil spills that pollute seas and affect all marine life. The Mediterranean Sea has been declared a dead sea since 1950 due to excessive pollution from nearby countries. It can support no aquatic life.

1. Pathogenic pollution is related with-

(A) Harmful chemicals               (B) Radioactive elements

Pollution of air and water Worksheet-9

True/False:

1. Only 10% of atmosphere spreads up to about 30 kilometres from the surface of the sea.

2. In dry air, from volume point, nitrogen (N₂) is 78% and oxygen is 21%.

3. Substances polluting air, water and earth are called pollutants.

4. Photochemical oxidants are produced on reaction of carbons and oxides

5. Air pollution causes increased Blood pressure in Human.

6. Industrial area should be kept away from human residence.

7. Instead of CNG, other fuels like petrol and diesel should be used for our vehicle