Chapter-16. Air And Water Pollutions

Ques: What is landfill? 

Ans: The area where collected garbage from a city or town is diumped is called landfill. 

Ques: What is garbage? 

Ans: The wastages generated from our day to day actvities are called garbage. 

Ques: Classify the garbages on the basis of uses. 

Ans: Garbages are classified into two part on the basis of uses. 

(i) Useful components 

(ii) Non-useful components

Ques: How long is landfill is not used for building construction? 

Ans: Landfill is not used for building construction for next 20 years. 

Ques: Which types of garbages are dumped in landfill? 

Ans: Non-useful components are dumped in landfill. 

Ques: What indicates the black colour and no foul smell of garbages? 

Ans:  the black colour and no foul smell of garbages indicates that rotting of garbages is completed. 

Ques: What is composting? 

Ans: The rotting and conversion of some materials into manure is called ‘composting’.

Ques: What is the role of separates dustbins to collect garbages? 

Ans: In some cities and towns muncipalities provide separate dustbins for collecting two kinds of garbage. Usually one is coloured blue and the other green. The blue bin is for materials that can be used again — such as plastics, metals and glass. The green bins are for collecting kitchen and other plant or animal wastes.

Ques: For what materials blue bins are used ? 

Ans: The blue bin is for materials that can be used again — such as plastics, metals and glass.

Ques: For what materials green bins are used ? 

Ans: The green bins are used for collecting kitchen and other plant or animal wastes.

Ques: What are the features of materials which are collected in green bins? 

Ans: 

(i) These are mostly kitchen, plants and animals wastes.

(ii) They rot (decompose) completely. 

(iii) They do not harm environment. 

(iv) These are used for making manures.