Soil Organic Matter MCQs Quiz 9

1. In soil, ___________________ regulates  decomposition rate

 Soil moisture ratio

 pH ratio

 C:N ratio

 CEC ratio

2. Soil carbon loss is most accelerated under ________________

 Increased soil disturbance and oxygen exposure

 High clay content

 Cool climate

 Addition of organic matter

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

 Carbon dioxide

 Hydrogen

 Nitrogen

 Oxygen

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

 Nitrification

 Denitrification

 Mineralization

 Immobilization

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

 Sand fraction

 Soil water

 Soil organic matter

 Silt fraction

6. 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

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

 Humification

 Leaching

 Immobilization

 Mineralization

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

 Ammonia

 NH₄⁺, NO₃⁻

 Stable organic forms

 Gaseous nitrogen exclusively

9. Vermicompost enhances soil aggregation primarily through ______________

 Increasing soil acidity to bind particles chemically

 Reducing overall soil microbial activity

 Increasing the sand fraction in soil

 Production of polysaccharides and other microbial binding agents

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

 Aerobic windrow composting

 Anaerobic digestion

 Pit composting

 Vermicomposting

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