Soil Organic Matter MCQs Quiz 9

1. Under aerobic conditions, main gas released during decomposition is _________

 Nitrogen

 Oxygen

 Hydrogen

 Carbon dioxide

2. Vermicompost enhances soil aggregation primarily through ______________

 Increasing soil acidity to bind particles chemically

 Increasing the sand fraction in soil

 Reducing overall soil microbial activity

 Production of polysaccharides and other microbial binding agents

3. In soil, ___________________ regulates  decomposition rate

 C:N ratio

 pH ratio

 Soil moisture ratio

 CEC ratio

4. Conversion of inorganic nutrients into microbial biomass is called ______________

 Denitrification

 Nitrification

 Immobilization

 Mineralization

5. Which soil component most significantly influences nutrient availability, structure, and biological activity?

 Soil organic matter

 Sand fraction

 Silt fraction

 Soil water

6. Soil carbon loss is most accelerated under ________________

 Cool climate

 Increased soil disturbance and oxygen exposure

 Addition of organic matter

 High clay content

7. Which organic amendment is most effective in long-term improvement of cation exchange capacity of a sandy soil?

 Fresh green biomass

 Raw poultry manure

 Well-decomposed vermicompost

 Fresh FYM

8. Nitrogen mineralization is best defined as the microbial conversion of organic nitrogen into _______

 Gaseous nitrogen exclusively

 Stable organic forms

 Ammonia

 NH₄⁺, NO₃⁻

9. Which process leads to the formation of chemically complex, recalcitrant organic compounds that resist microbial breakdown?

 Humification

 Mineralization

 Immobilization

 Leaching

10. Which composting method involves turning the pile regularly to maintain aerobic conditions and achieve rapid decomposition?

 Pit composting

 Vermicomposting

 Anaerobic digestion

 Aerobic windrow composting

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