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