1. Hydrolysis of Al³⁺ in soil contributes to _______

 Acidity

 Neutrality

 Salinity

 Alkalinity

2. Which element becomes toxic in soils at low pH due to increased solubility?

 Potassium

 Magnesium

 Calcium

 Aluminum

3. The term “soil reaction” refers to the _______ of soil

 pH

 Moisture content

 Texture class

 Temperature regime

4. Soil solution equilibrium is best described as _______

 Irreversible

 Linear

 Dynamic

 Static

5. Soils of arid and semi-arid regions are generally _______

 Alkaline

 Variable

 Acidic

 Neutral

6. Which form of nitrogen predominantly accumulates in acidic soils?

 NO₃⁻

 NO₂⁻

 NH₄⁺

 N₂

7. Carbonate (CaCO₃) dissolution in soils consumes _______

 Na⁺

 OH⁻

 Ca²⁺

 H⁺

8. Continuous application of ammonium-based fertilizers generally _______ soil pH

 Raises pH

 Has no effect

 Decreases pH

 Neutralizes pH

9. Soil alkalinity generally increases due to the presence of _______

 Acid rain inputs

 Organic acid accumulation

 Leaching of bases

 Carbonates and bicarbonates

10. Acid rain primarily introduces _______ into soils

 Calcium carbonate

 H₂SO₄ & HNO₃

 Sodium ions

 Organic matter

 Loading …

Question 1 of 10