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