MCQs Soil Science-46 Posted on May 5, 2025August 30, 2025Author agropublishers 0 1. Ammonification is the process by which microorganisms break down organic matter and can release _________ as an end product N₂O N₂ NH₄⁺ NO₃⁻ 2. ___________ element is not released through mineralization Carbon (C) Aluminum (Al) Phosphorus (P) Nitrogen (N) 3. The “Global Soil Partnership” (GSP) was launched by _________________ USAID FAO World Bank UNDP 4. _________ is vital for nitrogen fixation in soil Lactobacillus Rhizobium Streptococcus E. coli 5. The conversion of organic nitrogen to inorganic nitrogen (ammonia) is called_________ Ammonification Mineralization Immobilization Nitrification 6. Which process competes with mineralization for nitrogen? Volatilization Immobilization Denitrification Nitrification 7. The mass of ONE mole of K2HPO4 is approximately ________ grams 348.2 89 174.17 136.1 8. Which soil pH range is more suitable for nitrification? 8.5–10.0 <3.0 3.0–5.0 6.5–8.0 9. Sulfur mineralization is the process by which microorganisms break down organic sulfur compounds in the soil, releasing _________ Elemental S H₂S SO₂ Sulfate ions (SO₄²⁻) 10. Which of the following is the primary indicator of soil health? Soil organic carbon Soil color Soil temperature Soil texture Loading … Question 1 of 10
