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)?

 Nucleic Acid

 Sugars

 Lignin and its derivatives

 Proteins

3. Which factor primarily controls the rate of humification?

 Soil depth

 Rock type

 Water content

 Quality and composition of organic inputs

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

 Clay content

 Organic additions

 Low temperature

 Frequent aeration and disturbance

5. Nitrogen mineralization results in the release of _________ nitrogen

 Inorganic nitrogen

 Organic nitrogen

 Ammonium form only

 Gaseous form only

6. Soil organic matter accumulation is highest in__________

 Dry soils

 Hot soils

 Sandy soils

 Cold soils

7. Soil organic matter improves soil resilience primarily by _________

 Enhancing structural stability

 Hardening the soil

 Increasing erosion

 Facilitating vertical nutrient movement

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

 Humification

 Leaching

 Immobilization

 Mineralization

9. Soil fertility depends most strongly on ___________

 Water availability

 Sand content

 Silt content

 Soil organic matter content

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

 Sand particles

 Gravels

 Organic colloids

 Large silt particles

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