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