Soil Organic Matter MCQs Quiz 10

1. ____________ is the main gaseous loss during improper Farmyard Manure storage

 Hydrogen sulfide

 Oxygen

 Ammonia

 Carbon monoxide

2. Which nutrient is mainly supplied to soil through the decomposition of proteins in Soil Organic Matter?

 Carbon

 Oxygen

 Hydrogen

 Nitrogen

3. Immobilization in soil systems is best described as the microbial assimilation of _______________

 Inorganic, plant-available nutrients into microbial biomass

 Nutrients into gaseous losses

 Liquid nutrients into solid minerals

 Organic nutrients into mineral forms

4. Why does soil organic matter enhance water retention in soil?

 Because of charged sand particles

 Because of highly absorbent organic colloids

 Because of mineral content

 Because of large particle size

5. The resilience of soil systems under stress (e.g., drought, erosion) is enhanced by Soil Organic Matter through __________

 Increased bulk density

 Improved aggregate stability and structural integrity

 Surface hardening

6. _____________ is the organic fertilizer produced using earthworms

 Vermicompost

 Biochar

 Green manure

 Compost

7. The rate of humus formation depends mainly on _____________

 Soil profile depth

 Parent rock material

 Moisture alone

 Chemical nature of organic residues

8. Maximum Soil Organic Matter accumulation occurs under conditions where _________

 Moisture is absent

 Organic input exceeds decomposition due to low temperature

 Decomposition rate exceeds input

 Virgin soils

9. Which class of organic compounds is most responsible for long-term SOM stability due to resistance to microbial decomposition?

 Amino acids

 RNA

 Lignin-derived compounds

 Monosaccharides

10. The nutrient release pattern of vermicompost is best described as ______________

 Immediate and short-lived

 Completely immobilized

 Delayed and negligible

 Slow and potentially synchronized with plant demand

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