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Biology > EXAM > Diagnostic Examination (Soil Science (All)

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Diagnostic Examination (Soil Science

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1. Soil particles whose size is less than 1 micron. a. soil colloids b. sand c. silt d. organic matter 2. The orderly arrangement of atoms in the clay crystalline structure. a. lattice structure b. iron oxide c. kaolinite d. silicate 3. The process whereby ions adsorbed on the surface of soil colloids are exchanged for ions in the soil solution. a. anion exchange b. cation exchange c. ion exchange d. isomorphous substitution 4. A 25-gm soil saturated with 5 me Ca2+ has a cation exchange capacity equal to. a. 5 me/100 gm soil b. 10 me Ca/100 gm soil c. 20 me Ca/100 gm soil d. 25 me Ca/100 gm soil 5. The general form of nutrients taken up by plants. a. compounds b. ions c. molecules d. nutrients 6. An element which is an important component of plant cell wall. a. calcium b. magnesium c. nitrogen d. phosphorus 7. The microorganism responsible for the conversion of nitrite to nitrate. a. azotobacter b. mycorrhizae c. nitrobacter d. nitrosomonas 8. The conversion of organic to inorganic forms of nitrogen. a. immobilization b. mineralization c. nitrification d. volatilization 9. The loss of nitrogen into the atmosphere in the form of ammonia. a. ammonifaction b. dentirification c. nitrification d. volatilization 10. The element which fixes phosphorus at low soil pH. a. aluminum b. calcium c. iron d. manganese 11. It is also known as white alkali soil. a. alkaline b. saline c. saline-sodic d. sodic 12. It is also called as burned lime. a. CaCO3 B. CaO c. CaMg(CO3)2 d. Ca(OH2) 13. It is defined as the capacity of a liming material to neutralize acids expressed as a percentage of the molecular weight of CaCO3. a. percent base saturation b. percent calcium carbonate c. neutralization reaction d. relative neutralizing power 14. The following are beneficial effects of lime, except: a. it improves soil structure b. it decreases hydrogen-ion concentration c. it increases availability of micronutrients d. it stimulates microbial activities 15. The group of soil microorganisms which have the ability to photosynthesize. a. algae b. fungi c. nematodes d. protozoa 16. A group of microorganisms which can produce antibiotic compounds that kill other microorganisms. a. actinomycetes b. bacteria c. nematodes d. protozoa 17. It refers to the influence of one adsorbed ion on the release of another from the surface of colloid. a. cation exchange b. com

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