2nd Class Science Air, Water and Weather Pollution

Pollution

Category : 2nd Class

*       Pollution

 

Pollution means contamination of unwanted substances that causes harm to human and other living organisms. Various kind of pollutions are given below:

  

*         Air Pollution

 Air get contaminated in such type of pollution because of the following:

Various kind of smokes from industry, vehicles and other things.

Excretion of living organisms at improper places, '

Filthy and garbage materials lying at improper places.

Sneezing and breath of living organisms carrying diseases.

 

Look at the following picture of the cause of air pollution:

 

 

 

 

*          Water Pollution

Water bodies (Seas, oceans, rivers, lakes ponds and groundwater) get contaminated when:

Garbage, dirty materials are thrown in the rivers, ponds, lakes etc.

Industrial wastes and chemicals get mixed into the waters of rivers, ponds, seas and lakes.

Detergents are used while washing clothes and taking bath into rivers, lakes, ponds.

Dead bodies of water animals cause water pollution.

 

Look at the following picture of the cause of water pollution:

  

 

 

 

*         Sound Pollution or Environmental Noise

Noise pollution means unbearable and displeasing sound to human and other living organisms.

 The following causes noise pollution:

Noise produced by mode of transportations like rail, vehicles, aircrafts etc.

Industrial noise.

Emergency service sirens

Fireworks

Loudspeakers, loud volume of radio, television, tape-recorders and other audio/ video entertainment systems.

Barking dogs

 

Look at the following picture of the cause of noise pollution:

  

   

 

 

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      Pollution means______________.

(a) Purification

(b) Education

(c) Sanitation

(d) Contamination

 

Answer: (d)

Explanation

Pollution means contamination. Therefore, option (D) is correct and rest of the options is incorrect.

 

 

       Which one of the following is true?

(a) A bad and offensive smell pollutes air

(b) Pollution is good for health

(c) Water cannot be polluted

(d) Sound cannot be polluted

 

Answer: (a)

Explanation 

A bad and offensive smell pollutes air. Therefore, option (A) is correct and rest of the options is incorrect.

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