MCQs Soil Science-58 Posted on November 30, 2025November 30, 2025Author agropublishers 0 MCQs Soil Science-58 1. A higher C:N ratio in residues leads to ———- Increased humus decay Faster decomposition Nitrogen immobilization Nitrogen mineralization 2. Nitrogen is usually the most limiting nutrient in crop production True False 3. Humus increases soil fertility by improving ————- All of these Soil aeration Drainage Cation Exchange Capacity 4. ————– are the most efficient and dominant organisms in decomposing lignin-rich materials like wood Fungi Bacteria Algae Actinomycetes 5. Root exudates promote microbial growth in the rhizosphere True False 6. Rhizobia, bacteria live in the roots of leguminous plants, play a crucial role in _________ Nitrogen fixation Pathogen defense Nutrient uptake Water absorption 7. Soil enzyme activity decreases with heavy metal pollution True False 8. Which fraction of soil organic matter decomposes fastest? Humus Humic acid Humin Fresh residues 9. Clay soils generally have higher fertility than sandy soils True False 10. A productive soil under one crop may ———- Lose fertility instantly Never change in productivity Be always equally productive for all crops Be unproductive for another Loading … Question 1 of 10
