Quiz on Soil ScienceQuiz – 3 - January 4, 2021 | January 4, 2021 - AgriScan 1 minute read QUIZ STARTResults #1. Which of the following is called Agricultural lime? CaSiO3 CaO Ca(OH)2 CaCO3 #2. Which is the CCE of basic slag? 109 179 86 136 #3. Shape of Halloysite is ______? Needle shaped Floppy Plate shaped Tubular #4. Basal spacing of illite is _______? 20 A 14 A 7.2 A 10.1 A #5. Which one of the following is not an example of metamorphic rock? Granite Calcite Marble Gneiss #6. Basic rocks contains ________ % of silica? 65 - 70 55 - 65 40 - 55 20 - 30 #7. What is the % of Fe in Earth’s crust? 49.39 4.71 8.67 27.2 #8. Which one of the following is te source of both CA & MG? Apatite Dolomite Gypsum Olivine #9. Soil order that is characterized by peat, bog, Organic soil (>20 % organic matter) is called ______? Entisols Oxisols Gelisols Histosols #10. Newer alluvium is also termed as _______? Khaddar None Bhangar #11. Honeycomb like structure found in which soil? Black Lateritic Alluvium Red #12. Which of the microorganisms is highest in soil in terms of biomass? Virus Actinomycetes Bacteria Fungi #13. Rhizobium is nutritionally _______? Heterotrophic anaerobic Autotrophic aerobic Autotrophic anaerobic Heterotrophic aerobic #14. Which is not true for humus? N = 5% C:N = 10:1 C = 15% CEC = 200 - 400 meq/100g #15. Soil is considered as organic soil when it contains at least ______% of organic manner? 20 10 5 50 #16. Which of the following does take longest time to decompose? Sugar protein lignin Cellulose #17. The fraction of humus having higher molecular weight and insoluble in both acid and alkali is called ______? Humin Hymatomelanic acid Fuluic acid Humic acid #18. The C content in organic matter is ________? 20% 1.724% 58% 0.78% #19. Which is essential for Ammonia volatilization? ASB High temperature Submergence Alkaline medium Previous Finish
