Soil Organic Matter MCQs Quiz 10

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

 Because of highly absorbent organic colloids

 Because of mineral content

 Because of large particle size

 Because of charged sand particles

2. _____________ is the organic fertilizer produced using earthworms

 Compost

 Biochar

 Green manure

 Vermicompost

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

 Carbon monoxide

 Ammonia

 Hydrogen sulfide

 Oxygen

4. The rate of humus formation depends mainly on _____________

 Parent rock material

 Soil profile depth

 Moisture alone

 Chemical nature of organic residues

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

 Delayed and negligible

 Immediate and short-lived

 Slow and potentially synchronized with plant demand

 Completely immobilized

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

 Surface hardening

 Increased bulk density

 Improved aggregate stability and structural integrity

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

 Nitrogen

 Hydrogen

 Carbon

 Oxygen

8. 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

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

 RNA

 Amino acids

 Monosaccharides

 Lignin-derived compounds

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

 Inorganic, plant-available nutrients into microbial biomass

 Liquid nutrients into solid minerals

 Nutrients into gaseous losses

 Organic nutrients into mineral forms

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