Multiple Choice Questions for Exam 3 - Fundamental of Soil Science | SOIL 2124, Exams of Agricultural engineering

Download Multiple Choice Questions for Exam 3 - Fundamental of Soil Science | SOIL 2124 and more Exams Agricultural engineering in PDF only on Docsity! Fundamentals of Soil Science SOIL 2124 Exam 3-A Multiple Choice (2 pt. Each, Total = 30) 1. Which soil gas remains most constant in the soil? a) CO2 b) O2 c) N2 d) H2O 2. Which of the following are basic cations? a) Al3+, K+, Na+, NH4 + b) K+, Ca2+, Mg2+, Na+ c) Mg2+, K+, Ca2+, NH4 +, Na+ d) H+, Ca2+, Mg2+, Na 3. For a 20x20 meter garden in Stillwater, OK, which method would allow you the greatest increase in cation exchange capacity for the soil? a) Leach the soil by using a soaker hose b) Add organic residues c) Adding a load of river sand from Perkins d) Add gypsum 4. Which of the following is the correct equation to represent aerobic respiration that is one of the most important biochemical processes for many organisms? a) C6H12O6 + 6CO2 è 6O2 + 6H2O + energy b) C6H12O6 + 6O2 è 6O2 + 6H2O + energy c) C6H12O6 + 6H2O è 6CO2 + 6O2 + energy d) C6H12O6 + 6O2 è 6CO2 + 6H2O 5. Anion exchange is . a) most likely to occur in an Oxisol b) most likely to occur in a soil located in a deciduous forest c) most likely to occur in a soil located in a tropical rain forest d) is a program for swapping out worker ants for army ants 6. The average CEC for soil orders is affected by the type of colloid present as documented in Table 8.3 and 8.7 in Brady and Weil. Knowing the soil formation characteristics of the soil orders, which soil orders would you have the greatest to least CEC? a) Ultisols > Entisols > Mollisols > Histosols b) Mollisols > Ultisols > Entisols > Histosols c) Histosols > Mollisols > Ultisols > Entisols d) Histosols > Mollisols > Entisols > Ultisols 7. Table 8.8 Brady and Weil listed the cation exchange properties of four different soil orders, an Ultisol, and Alfisol, a Mollisol and an Aridisol. The table focused on the exchangeable cations present in the soil. Based on the information in the table, your general knowledge of soil order geographical location in the US and formation characteristics, what statement is true about the basic cations? a) The Ultisols have more basic cations than the Mollisols b) The Alfisols have more basic cations than the Mollisols c) The Mollisols have more basic cations than the Alfisols d) The Mollisols and Ultisols have about the same amount of basic cations SOIL 2124 Exam 3A Fall 2002 pg. 2 8. If a primary mineral were in a climate where it is subjected to rapid removal of bases, most often as a result of chemical weathering, which colloid would be formed? a) Chlorite b) Smectite c) Kaolinite d) Illite 9. For the following conditions, when would diffusion be the dominant process for air movement through a soil profile? a) When there are high-pressure zone moving into the region causing a difference in atmospheric pressure and soil atmospheric pressure. b) A soil is flooded following a prolonged dry period. c) Plant roots give off O2 from photosynthesis causing a higher partial pressure of oxygen in the soil. d) Plant roots give off CO2 from respiration causing a lower partial pressure of oxygen in the soil. 10. Based on figure 8.21 and table 8.5 in Brady and Weil, which soil colloid would have the most cation exchange capacity as a result of isomorphic substitution? a) Montmorillonite b) Humus c) Kaolinite d) Goethite 11. What properties make colloids so important for terrestrial based organisms? a) Cation exchange capacity b) Exchange capacity and isomorphic substitution c) Surface area and exchange capacity d) Surface area, water adsorption and exchange capacity 12. Which soil texture would you expect to have the greatest cation exchange capacity? a) Loamy sand b) Sandy loam c) Clay loam d) Silt loam 13. Oxygen diffusion rate measures how rapidly oxygen can move through the soil. There is a depth in the soil where the diffusion rate is not rapid enough to allow plant roots to survive. What is the approximate concentration of O2 needed to keep the roots alive? a) 78% b) 21% c) 10% d) 0.003% 14. Which soil colloid would be most useful for ensuring the clay liner at the Yost landfill (that is where your trash is deposited) does not leak pollutants into the aquifer? a) Humus b) Illite c) Smectite d) Kaolinite 15. What three factors must be in place for a soil to become reduced? a) Lack of oxygen, microbes and iron b) Flooding, microbes and iron c) Flooding, microbes and readily available carbon source