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 increase in 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