1. Deforestation means:

2. Ill effect of deforestation is it:

3. Increased level of carbon dioxide in the atmosphere traps the heat rays reflected by the earth causing an increasein the temperature on the earth. This is:

4. Part of the earth which supports life where living beings exists is called ____:

5. Variety of organisms existing on the earth, their interrelationships and their relationship with the environment is called:

6. Species of plants and animals which are found exclusively in a particular area are called:

7. Animals whose numbers are reducing to a level that they might face extinction are:

8. ____ is the Source book which keeps a record of all the endangered animals and plants.:

9. Migratory birds fly to far off places in a particular season of the year because that place becomes:

10. Reforestation means: