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