MCQs Soil Science-47 Posted on May 6, 2025August 30, 2025Author agropublishers 0 1. Humus is a decomposed form of _________ Soil microorganisms Hemicellulose Soil organic matter Hormones 2. Mineralization is slowest in___________ Arctic tundra Agricultural fields near equator Tropical forests Temperate grasslands 3. Topaz (Mohs hardness 8) is least likely to be found in which soil type? Clayey soil Loamy soil Silt soil Sandy soil 4. ________, the end product of nitrogen mineralization, can be used by plants Nitrate-N Nitrogen gas Organic-N Ammonium-N 5. Ecologically, which of the following adequately describes biodegradation? Fragmentation of a complex organic molecule All of these Breakdown of organic molecules Complete transformation of the organic molecule to mineral forms 6. Which practice can potentially reduce Nitrogen mineralization? Organic mulching Crop rotation Excessive tillage Liming acidic soils 7. The “Priming Effect” is associated with the _________ None of these Increased mineralization due to fresh OM addition Soil compaction Nutrient leaching 8. In clay-rich soils, which mineral is softest (Mohs hardness 1-2)? Calcite Dolomite Quartz Kaolinite 9. Which of the following is not a cause of waterlogging? Crop sowing time River flooding Poor canal drainage system Heavy rainfall 10. What type of sediment is deposited in glacial lakes? Fluvial Lacustrine Glaciomarine Glaciolacustrine Loading … Question 1 of 10
