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