Soil Organic Matter MCQs Quiz 9

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

 Nitrogen

 Carbon dioxide

 Oxygen

 Hydrogen

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

 Raw poultry manure

 Fresh green biomass

 Well-decomposed vermicompost

 Fresh FYM

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

 Anaerobic digestion

 Pit composting

 Vermicomposting

 Aerobic windrow composting

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

 Silt fraction

 Soil organic matter

 Sand fraction

 Soil water

5. In soil, ___________________ regulates  decomposition rate

 CEC ratio

 Soil moisture ratio

 pH ratio

 C:N ratio

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

 Mineralization

 Leaching

 Immobilization

 Humification

7. Vermicompost enhances soil aggregation primarily through ______________

 Increasing soil acidity to bind particles chemically

 Increasing the sand fraction in soil

 Production of polysaccharides and other microbial binding agents

 Reducing overall soil microbial activity

8. Soil carbon loss is most accelerated under ________________

 Cool climate

 Increased soil disturbance and oxygen exposure

 Addition of organic matter

 High clay content

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

 Immobilization

 Nitrification

 Denitrification

 Mineralization

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

 Gaseous nitrogen exclusively

 Stable organic forms

 NH₄⁺, NO₃⁻

 Ammonia

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