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

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

3. Among the following, the only secondary pollutant is

4. The gas associated with global warming is

5. Prevailing winds affect a region's climate by

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

7. Which of the following does not cause soil erosion

8. Pineapple variety suitable for canning is

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

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

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

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

13. Richest source of riboflavin is

14. What are air pollutants

15. Proteins are made up of

16. In water pollution, industries are said to be

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

18. One of the following is a water soluble vitamin

19. Carbohydrate content in potato is

20. Mango variety having strong flavor is