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