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