Fundamentals of Plant Nutrition MCQs Quiz 18

1. Micropores are primarily important for _______

 Nutrient leaching

 Soil erosion

 Water retention

 Gas exchange

2. Denitrification involves _______

 Reduction of nitrate to gaseous nitrogen forms

 Assimilation of nitrogen into proteins

 Conversion of nitrogen gas into ammonium

 Oxidation of nitrate to nitrite

3. The primary physiological function of Potassium in plants is _______

 Protein synthesis

 Cell wall formation

 DNA synthesis

 Osmoregulation

4. During early of organic matter decomposition in soil, nitrogen is generally _______

 Immobilized

 Unavailable

 Lost as gas

 Mineralized

5. Nitrogenase enzyme is involved in _______

 Nitrogen fixation

 Ammonification

 Denitrification

 Nitrification

6. Balanced soil chemical properties ensure _______

 Optimal nutrient availability

 Maximum leaching

 Low microbial activity

 High compaction

7. Soil compaction restricts nutrient movement primarily by reducing _______

 Clay content

 Porosity

 Organic matter

 Bulk density

8. In alkaline soils, phosphorus is predominantly absorbed by plants as _______

 Secondary orthophosphate (HPO₄²⁻)

 Organic phosphate

 Primary orthophosphate (H₂PO₄⁻)

 Polyphosphate

9. Phosphorus fixation in alkaline soils occurs mainly due to reaction with _______

 Calcium

 Magnesium

 Aluminum

 Iron

10. Biological nitrogen fixation converts atmospheric nitrogen (N₂) into _______

 N₂O

 NO₃⁻

 NO₂⁻

 NH₃

 Loading …

Question 1 of 10

Fundamentals of Plant Nutrition MCQs Quiz 18