Fundamentals of Plant Nutrition MCQs Quiz 8

1. The uptake of NH₄⁺ by plant roots results in the release of _______

 NO₃⁻

 H₂O

 OH⁻

 H⁺

2. Potassium in soil and plant tissues is commonly determined using _______.

 Gas chromatography

 Spectrophotometer

 Atomic absorption spectrophotometer

 Flame photometer

3. Poor soil structure limits nutrient availability by reducing _______

 Water infiltration

 Soil classification

 Soil color

 Cation Exchange Capacity

4. Soil aggregation influences nutrient cycling mainly by _______

 Reducing porosity

 Increasing bulk density

 Reducing microbial activity

 Protecting organic matter

5. In dry soils, nutrient uptake is limited mainly due to reduced _______

 Fixation

 Diffusion

 Volatilization

 Leaching

6. An element required only under specific environmental conditions (e.g., stress mitigation) is best classified as _______

 Beneficial nutrient

 Structural nutrient

 Conditional essential nutrient

 Essential nutrient

7. High application of phosphorus can _______ zinc uptake by plants

 Increase

 Decrease

 Completely inhibit

 Have no effect

8. Volatilization losses of nitrogen are higher in _______ soils

 Alkaline

 Acidic

 All types of

 Neutral

9. Soil structure affects nutrient availability by influencing _______

 Soil color

 Aggregate stability

 Soil taxonomy

 Wind erosion only

10. Eutrophication in aquatic systems is primarily caused by excess _______

 Phosphorus

 Nitrogen

 Phosphorus and potassium

 Nitrogen and phosphorus

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