Soil Organic Matter MCQs Quiz 6

1. Nitrogen mineralization results in the release of _________ nitrogen

 Inorganic nitrogen

 Organic nitrogen

 Ammonium form only

 Gaseous form only

2. Soil organic matter improves soil resilience primarily by _________

 Increasing erosion

 Enhancing structural stability

 Hardening the soil

 Facilitating vertical nutrient movement

3. Soil organic matter accumulation is highest in__________

 Dry soils

 Sandy soils

 Cold soils

 Hot soils

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

 Mineralization

 Humification

 Leaching

 Immobilization

5. Soil fertility depends most strongly on ___________

 Soil organic matter content

 Water availability

 Silt content

 Sand content

6. Which factor primarily controls the rate of humification?

 Rock type

 Quality and composition of organic inputs

 Soil depth

 Water content

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

 Solid → gas

 Inorganic → organic

 Liquid → gas

 Organic → inorganic

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

 Low temperature

 Frequent aeration and disturbance

 Organic additions

 Clay content

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

 Lignin and its derivatives

 Proteins

 Sugars

 Nucleic Acid

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

 Sand particles

 Organic colloids

 Large silt particles

 Gravels

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Question 1 of 10

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