Q4 of 20 Page 61

True or false

a. Water does not get polluted by washing the cloths in running water of the river.


b. More the use of electric appliances more will be the pollution.

(a) False

Explanation: Washing of clothes pollutes the water of the river bodies. The detergents act as pollutants and the same water when used for consumption causes ailments in humans.


(b) True


Explanation: The power plants use coal, crude oil and other fossil fuels for the production of electricity. Thus, the more electric appliances are used the more the burning of coal hence adding more pollutants into the atmosphere.


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2

Read the passage and identify the sentences expressing types of pollution.

Nilesh is a student of std. VIII and lives in the urban area. It takes about an hour to go to the school by bus. He faces the heavy traffic of two-wheelers, four wheelers, rickshaws, buses while going to school. He is facing the problem of asthma since last few days. Doctors recommended him to stay away from urban area. Since then, his mother sent him to the village of his maternal uncle. Nilesh saw the heaps of garbage at many places in the village. The foul smell of human and animal wastes was present in many places. Blackish water with foul smell was flowing in a stream. He developed some abdominal disease within a few days.

 3

Match the pairs from ‘A’ and ‘B’ columns and explain the effect of pollution on human health.

Column ‘A’


1. Water containing cobalt


2. Methane gas


3. Water containing lead


4. Sulphur dioxide


5. Nitrogen dioxide


Column ‘B’


a. Mental retardedness


b. Paralysis.


c. Inflammation of lungs.


d. Skin cancer


e. Irritation of eyes

 5

Answer the following.

What is pollution?

 5

Answer the following.

What are pollutants?