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