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