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