Fundamentals of Plant Nutrition MCQs Quiz 10

1. A nutrient involved in maintaining ionic balance but not part of plant structure is _______

 Regulatory nutrient

 Beneficial nutrient

 Structural nutrient

 Non-essential element

2. Interveinal chlorosis in young leaves is a characteristic symptom of _______ deficiency

 Zinc

 Nitrogen

 Iron

 Boron

3. Soil temperature affects nutrient dynamics by controlling _______

 Soil texture

 Soil structure

 Soil density

 Microbial activity

4. Due to its narrow deficiency-to-toxicity range, excess application of _______ can easily harm plants

 Phosphorus

 Nitrogen

 Iron

 Boron

5. Which of the following elements is essential but not a structural component of organic molecules?

 Carbon

 Sulfur

 Nitrogen

 Potassium

6. Soil compaction reduces nutrient availability mainly due to _______

 Higher microbial activity

 Restricted root access

 Increased porosity

 Improved aeration

7. Net nitrogen mineralization generally occurs when C:N ratio is _______

 Below 20–25:1

 Between 30–40:1

 Exactly 50:1

 Above 40:1

8. A residue with a C:N ratio of 80:1 will most likely cause _______

 Immediate nitrate leaching

 Nitrogen immobilization

 Rapid nitrogen mineralization

 No effect on nitrogen dynamics

9. Balanced soil physical conditions optimize nutrient dynamics by improving _______.

 Biological activity

 Water–air–root interactions

 Chemical properties

 Soil color

10. Nitrogen is absorbed by plants mainly in the form of _______

 Organic nitrogen

 Ammonium and nitrate

 Ammonia and urea

 Ammonium and nitrite

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