MCQs Soil Science-52 Posted on May 10, 2025August 30, 2025Author agropublishers 0 1. __________ is a soil particle that feels powdery to the touch when dry Silt Loam Sand Clay 2. How can heavy metal-contaminated soil be improved? Phyto-stabilization Phytoremediation All of these Amendments 3. Phosphorus (P) precipitation, along with limited plant availability in soil with high pH, is mainly attributed to ___________? High level of organic matter Low microbial activity High iron (Fe) and aluminum (Al) content High calcium content 4. What is the primary mechanism by which soil organic matter enhances soil nutrient retention? Reducing soil porosity through compaction Regulating Cation exchange capacity (CEC) Improving water-holding capacity Soil pH buffering Improving soil structure 5. Macronutrients are required in large amounts and normally constitute __________ of a plant’s dry weight 1000 mg kg –1 (0.1%) or more 10,000 mg kg –1 (1.0%) or more Less than 400 mg kg –1 (0.04%) approximately 500 mg kg –1 (0.05%) 6. During which geologic time did Earth form and undergo its early development? Precambrian Cenozoic Mesozoic Paleozoic 7. _________ rocks are formed from the cooling and crystallization of magma deep within the Earth’s crust Sedimentary Igneous None of these Metamorphic 8. Exchangeable and soluble metal ions in soils are termed as _________ Adsorbed Ions Fixed Ions Available Ions Residual Ions 9. ________________ does NOT significantly affect the bioavailability of toxic chemicals Organic matter content Chemical solubility Atmospheric pressure Soil pH All of these 10. Which of the following practices can reduce evaporation and increase infiltration? Mulching Overgrazing Crop Rotation Siltation Loading … Question 1 of 10
