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

2. What are air pollutants

3. The gas associated with global warming is

4. One of the following is a water soluble vitamin

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

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

7. Proteins are made up of

8. Among the following, the only secondary pollutant is

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

10. Carbohydrate content in potato is

11. Mango variety having strong flavor is

12. In water pollution, industries are said to be

13. Pineapple variety suitable for canning is

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

15. Which of the following does not cause soil erosion

16. Prevailing winds affect a region's climate by

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

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

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

20. Richest source of riboflavin is