Fundamentals of Plant Nutrition MCQs Quiz 13

1. Potassium is absorbed by plants in the form of _______

 K⁺

 KCl

 K₂SO₄

 K₂O

2. Nitrogen deficiency symptom appears first on _______

 Older leaves 

 Flowers

 Roots

 Young leaves

3. _______________ is the dominant process by which phosphorus moves through the soil to plant roots

 Leaching

 Diffusion

 Volatilization

 Mass flow

4. Phosphorus availability is enhanced by _______

 High pH

 Mycorrhizal association 

 Fixation

 Dry conditions

5. A residue with a C:N ratio above ~25–30:1 generally leads to _______

 Net immobilization

 Net mineralization

 Carbon loss only

 No decomposition

6. Potassium is classified as a _______ nutrient

 Primary macronutrient

 Secondary nutrient

 Micronutrient

 Beneficial element

7. Excessive soil aeration most commonly enhances _______ losses of nitrogen

 Volatilization

 Denitrification

 Immobilization

 Fixation

8. Potassium deficiency increases susceptibility to _______

 Flooding

 Diseases

 Salinity

 Drought

9. Decline in soil organic matter leads to _______

 Increased Cation Exchange Capacity

 Improved soil texture

 Improved fertility

 Reduced nutrient availability

10. In soils with high phosphorus fixation capacity, the most effective strategy to enhance Phosphorous-use efficiency is ________________________

 Localized band placement to reduce soil–Phosphorus interactions

 Leaching to move phosphorus into deeper horizons

 Uniform surface broadcasting to maximize soil contact

 Foliar application to bypass root uptake limitations

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Fundamentals of Plant Nutrition MCQs Quiz 13