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