Soil Organic Matter MCQs Quiz 6

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

 Organic → inorganic

 Solid → gas

 Inorganic → organic

 Liquid → gas

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

 Lignin and its derivatives

 Sugars

 Proteins

 Nucleic Acid

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

 Leaching

 Humification

 Immobilization

 Mineralization

4. Nitrogen mineralization results in the release of _________ nitrogen

 Gaseous form only

 Ammonium form only

 Inorganic nitrogen

 Organic nitrogen

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

 Large silt particles

 Organic colloids

 Gravels

 Sand particles

6. Soil fertility depends most strongly on ___________

 Water availability

 Sand content

 Soil organic matter content

 Silt content

7. Which factor primarily controls the rate of humification?

 Soil depth

 Quality and composition of organic inputs

 Water content

 Rock type

8. Soil organic matter accumulation is highest in__________

 Dry soils

 Hot soils

 Sandy soils

 Cold soils

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

 Frequent aeration and disturbance

 Low temperature

 Organic additions

 Clay content

10. Soil organic matter improves soil resilience primarily by _________

 Hardening the soil

 Enhancing structural stability

 Facilitating vertical nutrient movement

 Increasing erosion

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