Chapter 27 - Man and his Environment - 9

Biology Class 12
1. _______ is the study of human population and things that effect them.


Biology Class 12
2. Clearance of vast areas of forest for lumber, planting subsistence crops is called _______.


Biology Class 12
3. Forest is an environmental _______.


Biology Class 12
4. A single _______ atom can react with ultraviolet rays and destroy as one million ozone molecule


Biology Class 12
5. _______ refers to total number of different species with in an ecosystem.


Biology Class 12
6. Ozone molecule is made up of three _______ atoms bounded together.


Biology Class 12
7. A _______ is a chemical which destroys agricultural pests or competitors.


Biology Class 12
8. _______ are the chemical substances used to add additional nutrient in soil to increase fertility.


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