Revision 3

Conserving Our Environment

I.Give one word for the following:

1.To make impure or unclean-

2.The contamination of the environment by the discharge of harmful substances-

3.Things that can rot or be decomposed by biologic agents like bacteria-

4.Waste that rot and is used for manure for plants-

5.Planting of trees-

6.Cutting of trees-

II.Fill ups:

1.Walking short distances reduces _______.

2.We can reduce pollution by burning less ______.

3.Trees take in _______ and give out ______.

4._________ waste can be used to help the environment.

5.The process by which waste is converted into manure is called_______.

III.Match the following:

A B

1.Air pollution	_ paper and leaves
2.Land pollution	_ burning petrol
3.Water pollution	_ fertilizers
4.Biodegradable	_ plastic
5.Non-biodegradable	_ sewage from factories

IV.Write True or False:

1.When you use a plastic bottle to store water in the refrigrator you are reusing the bottle.__

2.Trees take in carbon dioxide and give out oxygen.__

3.When waste is not disposed properly,germs and diseases spread.__

4.Water pollution affects plants and animals living in water.__

5.Glass pieces found in the waste will not rot over time.__

6.Everything around us makes up our environment.__

7.Burning of fuel causes air pollution.__

8.Waste paper is biodegradable.__

9.Rotting of leaves can produce manure called compost.__

10.Cutting of trees is called aforestation.__