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