MCQs Soil Science-58 Posted on November 30, 2025November 30, 2025Author agropublishers 0 MCQs Soil Science-58 1. ————– are the most efficient and dominant organisms in decomposing lignin-rich materials like wood Actinomycetes Fungi Algae Bacteria 2. Soil enzyme activity decreases with heavy metal pollution False True 3. Nitrogen is usually the most limiting nutrient in crop production False True 4. Clay soils generally have higher fertility than sandy soils False True 5. Humus increases soil fertility by improving ————- Drainage All of these Soil aeration Cation Exchange Capacity 6. Root exudates promote microbial growth in the rhizosphere False True 7. Rhizobia, bacteria live in the roots of leguminous plants, play a crucial role in _________ Nutrient uptake Nitrogen fixation Pathogen defense Water absorption 8. 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 9. Which fraction of soil organic matter decomposes fastest? Fresh residues Humus Humin Humic acid 10. A higher C:N ratio in residues leads to ———- Faster decomposition Nitrogen immobilization Increased humus decay Nitrogen mineralization Loading … Question 1 of 10
