High School

Write T or F after each statement.

**True/False questions about urban soils:**

1. Except for some kinds of foods, modern industry has made human dependence on soils a thing of the past. ____

2. Most of the water in our rivers and lakes has come in contact with and has been affected by soils. ____

3. Soil air usually has a higher carbon dioxide content than the air in the atmosphere. ____

4. Plants can be grown without any soil. ____

5. Hydroponics will likely be a key element in enabling the world to feed and clothe its increasing human population in the next few decades. ____

6. Practices that tend to increase the amount of organic matter in soils would be expected to reduce the global greenhouse effect. ____

7. Although subsoil is more difficult to obtain, it is generally equally as good as topsoil for landscaping purposes. ____

8. Subsoil is typically equivalent to the O and A horizons. ____

9. The mineral particles in the fine earth fraction of the soil consist of sand, silt, and clay. ____

10. Where organic matter constitutes only 2 or 3 percent of the soil by weight, it has only negligible influence on soil properties. ____

11. When mixed with organic material, mineral material, especially clay-sized, can have a protective effect against biodegradation. ____

12. The complete set of A, B, C, and E horizons can be found in all soils. ____

13. While many organisms depend on the soil for nutrients and water, only a few very specialized organisms live in the soil itself. ____

14. If supplied with a suitable nutrient solution, plants can grow normally without any soil at all. ____

15. Natural soils (as opposed to modern farm soils) can recycle organic compounds, but not inorganic elements. ____

16. Soil properties such as bearing strength, compressibility, shear strength, and stability are more difficult to predict for soils than manufactured building materials. ____

17. Most, if not all, of the nutrient supply stored in a fertile soil is in forms readily available to plants. ____

18. Water in the soil solution is mostly pure and free of dissolved substances. ____

19. Minerals formed at high temperatures are generally very stable in the soil environment. ____

20. An anion is an atom that has gained one or more electrons and become a negatively charged ion. ____

21. Sandy soils have relatively high water and nutrient holding capacities. ____

22. Soil organic matter contents generally increase as the average temperature increases. ____

23. Soluble minerals like halite are among the most stable and long-lasting in the soil environment. ____

24. The O horizon is composed of organic soil material. ____

25. Smaller pore spaces in soils can hold water tighter than larger pores. ____

Answer :

1. False: Not eliminated human dependence on soils.

2. True: Most of the water in rivers and lakes has affected by soils.

3. True: Soil air has a higher carbon dioxide content.

4. True: Hydroponics technique.

5. True: Hydroponics is a technique for sustainable agriculture.

6. True: Organic in soils such as adding compost or using cover crops.

7. False: It has a lower organic matter content and limited nutrient availability.

8. False: Subsoil refers to the layer of soil.

9. True: The fine earth fraction of the soil consists of mineral particles, including sand, silt, and clay.

10. False: A small percentage of organic in the soil can have a soil properties.

11. True: Clay-sized mineral particles.

12. False: The complete set of A, B, C, and E horizons is not found in all soils.

13. True: A diverse range of microorganisms, including bacteria, fungi, nematodes, and earthworms.

14. True: Plants can grow normally without any soil.

15. False: Recycle both organic compounds and inorganic elements.

16. True: Soil properties, such as bearing strength, compressibility, shear strength, and stability, are more challenging to predict for soils.

17. False: A fertile soil is not readily available to plants.

18. False: Water in the soil solution contains dissolved substances, including minerals, organic matter, and gases.

19. True: Minerals formed at high temperatures, such as quartz or feldspar, are generally stable in the soil environment.

20. False: An anion is an atom that has gained one or more electrons and becomes a negatively charged ion.

21. False: Sandy soils have larger pore spaces.

22. False: Soil organic matter content tends to decrease as the average temperature increases.

23. True: Soluble minerals are stable.

24. False: The organic horizon, consists of organic soil material, such as decomposed leaves and organic debris.

25. True: Smaller pore spaces in soils have a higher water-holding capacity.

1. False: Agriculture and food production still heavily rely on soil resources.

2. True: Soils have a significant impact on the quality of water in rivers and lakes.

3. True: Soil respiration and microbial activity contribute to a higher carbon dioxide content in soil air compared to the atmosphere.

4. True: Use hydroponics system for plants.

5. True: Hydroponics is considered a potential solution for feeding and clothing the growing population.

6. True: Increasing organic matter in soils can sequester carbon dioxide and reduce the greenhouse effect.

7. False: Subsoil generally has lower organic matter content and nutrient availability.

8. False: Subsoil refers to the layer below topsoil, not necessarily equivalent to specific horizons.

9. True: The fine earth fraction of soil comprises sand, silt, and clay mineral particles.

10. False: Even a small percentage of organic matter in soil can influence soil properties.

11. True: Clay-sized mineral particles can protect organic material from biodegradation.

12. False: Not all soils contain the complete set of A, B, C, and E horizons.

13. True: Various specialized organisms inhabit and depend on soil for nutrients and water.

14. True: Plants can grow normally without soil if provided with a suitable nutrient solution.

15. False: Natural soils can recycle both organic compounds and inorganic elements.

16. True: Soil properties are often more challenging to predict compared to manufactured building materials.

17. False: Fertile soil contains nutrients in various forms, but not all are readily available to plants.

18. False: Water in the soil solution contains dissolved substances, including minerals and organic matter.

19. True: Minerals formed at high temperatures are generally stable in the soil environment.

20. False: An anion is a negatively charged ion formed by gaining one or more electrons.

21. False: Sandy soils have larger pore spaces, leading to lower water-holding capacity.

22. False: Soil organic matter content tends to decrease as the average temperature increases.

23. True: Soluble minerals like halite are stable and long-lasting in the soil environment.

24. False: The organic horizon consists of organic soil material, not necessarily all organic debris.

25. True: Soils with smaller pore spaces can retain water more tightly due to capillary forces.

Learn more about soils from the given link:

https://brainly.com/question/1286340

#SPJ11

Other Questions