Soil Organic Matter MCQs Quiz 8

1. Breakdown of organic matter into simpler substances is known as ____________

 Aggregation

 Leaching

 Humification

 Decomposition

2. A major contribution of farmyard manure (FYM) to soil organic matter (SOM) is_____________-

 Increase in labile and stable carbon pools

 Rapid nutrient release only

 Reduction in microbial biomass

 Decrease in soil porosity

3. How does adequate soil organic matter increase soil resilience to environmental stress?

 By increasing nutrient sink

 By increasing erosion risk

 By compacting soil

 By improving structural stability and aggregation

4. Vermicompost improves soil porosity primarily because it ___________________

 Reduces root penetration

 Promotes stable macroaggregate formation

 Adds fine sand particles to the soil

 Creates a hard pan in the subsoil

5. Which factor plays the most critical role in maintaining long-term soil fertility?

 Soil organic matter content

 Soil Structure

 Soil texture

 Soil moisture

6. Carbon fraction of soil organic matter is known as ______________________

 Soil organic carbon

 Inorganic carbon

 Humus carbon

 Total organic matter

7. Soil organic matter most likely to accumulate due to slow decomposition in ___________ climate

 Equatorial climate

 Hot tropical climate

 Cold climate

 Arid dry climate

8. The high water-holding capacity of soils rich in SOM is mainly attributed to __________

 Hydrophobic nature of silt particles

 Coarse particle fraction

 Hydrophilic nature of organic colloids

 Macropore dominance

9. Easily decomposable fraction of Soil Organic Matter is ___________

 Humus

 Passive pool

 Stable pool

 Labile fraction

10. In soil, humus is __________ part of organicm matter

 Inorganic

 Easily decomposed

 Stable

 Mineral

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