Fundamentals of Plant Nutrition MCQs Quiz 11

1. The “nitrogen mining” hypothesis suggests that microbes decompose SOM primarily to obtain _______

 Phosphorus

 Carbon

 Nitrogen

 Water

2. Cold soils (in cold areas) generally lead to _______

 Nutrient immobilization

 Rapid nutrient mineralization

 Increased leaching

 Higher diffusion rates

3. Soil texture influences nutrient leaching primarily through _______

 Soil color

 Organic coatings

 Clay mineralogy

 Pore size distribution

4. Biological nitrogen fixation converts atmospheric nitrogen into _______

 N₂O

 NO₃⁻

 NH₃ 

 NO₂⁻

5. Which process converts immobilized nitrogen back to plant-available forms?

 Fixation

 Volatilization

 Immobilization

 Mineralization

6. Volatilization loss of nitrogen is most prevalent primarily in _______ soils

 Saline only

 Acidic

 Alkaline

 Neutral

7. Microorganisms immobilize nitrogen when substrate C:N ratio is _______

 Low

 Moderate

 High

 Balanced

8. Zinc deficiency is common in rice due to _______.

 Low pH

 High aeration

 High pH and flooding

 Low moisture

9. In soil Phosphorus availability is enhanced by _______

 Dry conditions

 High pH

 Fixation

 Mycorrhizal association

10. Soil buffering capacity prevents rapid change in _______

 Moisture

 pH

 CEC

 Texture

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Fundamentals of Plant Nutrition MCQs Quiz 11