Soil Organic Matter MCQs Quiz 10

1. The rate of humus formation depends mainly on _____________

 Parent rock material

 Moisture alone

 Chemical nature of organic residues

 Soil profile depth

2. _____________ is the organic fertilizer produced using earthworms

 Vermicompost

 Green manure

 Compost

 Biochar

3. 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

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

 Increased bulk density

 Surface hardening

 Improved aggregate stability and structural integrity

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

 Carbon monoxide

 Hydrogen sulfide

 Ammonia

 Oxygen

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

 Immediate and short-lived

 Delayed and negligible

 Slow and potentially synchronized with plant demand

 Completely immobilized

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

 Moisture is absent

 Decomposition rate exceeds input

 Virgin soils

 Organic input exceeds decomposition due to low temperature

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

 Oxygen

 Nitrogen

 Hydrogen

 Carbon

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

 Because of mineral content

 Because of highly absorbent organic colloids

 Because of large particle size

 Because of charged sand particles

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

 Liquid nutrients into solid minerals

 Inorganic, plant-available nutrients into microbial biomass

 Organic nutrients into mineral forms

 Nutrients into gaseous losses

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