Soil Organic Matter MCQs Quiz 6

1. Soil organic matter improves soil resilience primarily by _________

 Facilitating vertical nutrient movement

 Increasing erosion

 Hardening the soil

 Enhancing structural stability

2. Which process transforms unstable organic matter into stable, resistant compounds?

 Immobilization

 Mineralization

 Humification

 Leaching

3. Which condition shifts the balance toward carbon loss from soil?

 Clay content

 Low temperature

 Organic additions

 Frequent aeration and disturbance

4. Soil fertility depends most strongly on ___________

 Soil organic matter content

 Water availability

 Silt content

 Sand content

5. Which component most strongly contributes to the formation of stable soil organic matter (humus)?

 Nucleic Acid

 Proteins

 Lignin and its derivatives

 Sugars

6. Soil organic matter increases water holding capacity primarily due to the presence of ___________

 Organic colloids

 Large silt particles

 Sand particles

 Gravels

7. Immobilization is the process by which nutrients are converted from _____________ to  ___________

 Inorganic → organic

 Solid → gas

 Liquid → gas

 Organic → inorganic

8. Nitrogen mineralization results in the release of _________ nitrogen

 Organic nitrogen

 Ammonium form only

 Inorganic nitrogen

 Gaseous form only

9. Which factor primarily controls the rate of humification?

 Rock type

 Quality and composition of organic inputs

 Soil depth

 Water content

10. Soil organic matter accumulation is highest in__________

 Dry soils

 Hot soils

 Cold soils

 Sandy soils

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