1. Which of the following does not vary predictably with the depth of the aquatic environment? Salinity
2. The ozone layer protects the Earth from ______ sent by the sun: Ultraviolet rays
3. The ozone layer is present in which layer of the atmosphere above the earth? Stratosphere
4. One of the main functions of the earth’s ozone layer is to______: Filter out ultraviolet rays
5. The Pakistani population receives the largest dose of ionizing radiation from______: Natural sources
6. Which are air pollutants? Aerosols
7. Which of the following does not cause soil erosion? Sun
8. The gas associated with global warming is______: Carbon dioxide
9. In water pollution, industries are said to be the_____: Point sources
10. Among the following, the only secondary pollutant is______: Ozone
11. Which of the following groups of plants can be used as indicators of SO2 pollution of air? Epiphytic lichens
12. Prevailing winds affect a region’s climate by______: Affecting how much precipitation it receives
13. Carbohydrate content in potato is______: 22%
14. Which refrigerant is commonly used in cold storage in our country? Liquid ammonia
15. Those at greatest risk for food-borne illness include______: Infants and children
16. Which one of the following is a water-soluble vitamin? Vitamin C
17. Mango variety having a strong flavor is______: Langra
18. Proteins are made up of______: Polypeptide
19. Pineapple variety suitable for canning is______: Kew
20. Richest source of Riboflavin is______: Bael