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