1. One of the main function of the Earth's ozone layer is to

2. The ozone layer is present in the atmosphere above earth. The stratum of atmosphere in which ozone layer lies is called as

3. Proteins are made up of

4. In water pollution, industries are said to be

5. One of the following is a water soluble vitamin

6. Prevailing winds affect a region's climate by

7. Which of the following groups of plants can be used as indicators of so pollution of air

8. Mango variety having strong flavor is

9. Which of the following does not cause soil erosion

10. What are air pollutants

11. Which refrigerant is commonly used in cold storage in our country

12. The gas associated with global warming is

13. Those at greatest risk of food-borne illness include

14. The ozone layer protects the earth from the rays sent by sun

15. Richest source of riboflavin is

16. Pineapple variety suitable for canning is

17. Which of the following does not vary predictably with the depth of the aquatic environment

18. Among the following, the only secondary pollutant is

19. Carbohydrate content in potato is

20. Pakistani population receives the largest dose of ionizing radiation from