Soil Organic Matter MCQs Quiz 10

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

 Moisture is absent

 Organic input exceeds decomposition due to low temperature

 Virgin soils

 Decomposition rate exceeds input

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

 Inorganic, plant-available nutrients into microbial biomass

 Organic nutrients into mineral forms

 Nutrients into gaseous losses

 Liquid nutrients into solid minerals

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

 Monosaccharides

 Lignin-derived compounds

 Amino acids

 RNA

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

 Oxygen

 Carbon monoxide

 Ammonia

 Hydrogen sulfide

5. _____________ is the organic fertilizer produced using earthworms

 Vermicompost

 Compost

 Green manure

 Biochar

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

 Because of mineral content

 Because of charged sand particles

 Because of large particle size

 Because of highly absorbent organic colloids

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

 Carbon

 Oxygen

 Nitrogen

 Hydrogen

8. 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

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

 Improved aggregate stability and structural integrity

 Increased bulk density

 Surface hardening

10. The rate of humus formation depends mainly on _____________

 Parent rock material

 Chemical nature of organic residues

 Soil profile depth

 Moisture alone

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