28 Solved Questions on Fundamentals of Soil Sciences - Exam 5 | SOIL 2124, Exams of Agricultural engineering

Download 28 Solved Questions on Fundamentals of Soil Sciences - Exam 5 | SOIL 2124 and more Exams Agricultural engineering in PDF only on Docsity! Fundamentals of Soil Science SOIL 2124 Exam 5-A Multiple Choice (2 pt. Each, Total = 34) 1. The primary functions of nitrogen in plants are . a) water regulation, enzyme activation, and enzyme formation b) amino acid synthesis, and enzyme formation c) RNA and DNA formation, amino acid synthesis, and ATP formation d) cell membrane integrity water regulation, enzyme formation, and RNA and DNA formation 2. The pool of N in the soil where most of the competition exist is a) animal manure's added b) NO 3 in soil solution c) NH4 fixed between clay colloids d) in the soil organic matter 3. The primary functions of potassium in plants are . a) amino acid synthesis, water regulation, and enzyme formation b) water regulation, amino acid synthesis, and ATP formation c) enzyme activation and water regulation d) water regulation, enzyme activation, enzyme formation, and cell membrane integrity 4. What is the controlling factor for phosphorus availability to plants of phosphorus in soil? a) Microbial activity b) Soil pH c) Cation exchange capacity d) Soil buffer capacity 5. The primary functions of phosphorus in plants are . a) RNA and DNA formation, cell membrane integrity and ATP formation b) enzyme activation, water regulation, enzyme formation, cell membrane integrity and ATP formation c) RNA and DNA formation, cell membrane integrity, enzyme formation, and ATP formation d) ATP formation amino acid synthesis, RNA and DNA formation, and cell membrane integrity 6. When nitrogen has been immobilized it means there has been a conversion from . a) atmospheric nitrogen to organic nitrogen in the organisms b) inorganic nitrogen to organic nitrogen in the soil c) organic nitrogen in the organisms to atmospheric nitrogen d) organic nitrogen to inorganic nitrogen in the soil 7. At which growth stage during the year does a perennial plant have the greatest requirement for nitrogen, phosphorus and potassium respectively? a) vegetative phase, reproductive phase and root preparation for dormancy b) reproductive phase, vegetative phase, and root preparation for dormancy c) root preparation for dormancy, reproductive phase and vegetative phase d) vegetative phase, root preparation for dormancy and reproductive phase 8. Conversion of ammonium to nitrite in the N cycle is a) conversion from the inorganic to organic forms b) controlled by Rhizobium c) controlled by Nitrosomonas d) conversion from the organic to inorganic forms SOIL 2124 Exam 5A Fall 2002 pg. 2 9. The transformation step in the N cycle from NO2 - to NO3 - is controlled by? a) Nitrosomonas b) Nitrobacter c) Rhizobium d) Azotobacter 10. Phosphorus is often limiting for plant growth because there is very little phosphate in the soil solution. The primary cause for the lack of available phosphate is ? a) low soil pH b) high soil pH c) the soil minerals have very little phosphorus to dissolve into soil solution d) the abundant supply of phosphorus in the soil minerals does not dissolve very rapidly 11. Mobile nutrients in the plant are required where the plant is growing most rapidly and are translocated to that portion in the plant. Which nutrient is immobile in the plant? a) N b) Ca c) P d) K 12. Phosphorus is often deficient in agricultural ecosystems however there is an adequate supply in many forest and grassland ecosystems. This is due to . a) a lower pH for the forest and grassland systems b) a lower pH for the agricultural systems c) the greater amount of biomass produced and removed on an annual basis from the agricultural system d) a greater amount of base cycling in the forest and grassland systems For the next four questions use the diagram of the N cycle provided. 13. Which pool of N is the greatest (kg/ha)? a) AA b) GG c) UU d) EE 14. Volatilization occurs during with step of the N cycle? No correct answer, my fault a) TT b) RR c) SS d) PP 15. Symbiotic additions to the N cycle occur in which step? a) PP b) CC c) BB d) RR 16. Which form of nitrogen acts as toxic compound for most organisms and is not adsorbed to soil colloids? a) GG b) EE c) HH d) FF