Soil Chemical Properties MCQs (Quiz 10)

1. Electrical conductivity (EC) of soil is used to measure _______

 Soil structure

 Soil acidity

 Soluble salt concentration

 Organic matter

2. Nitrate leaching primarily contaminates _______

 Groundwater

 Atmosphere

 Air

 Surface soil

3. Nitrification is the process of _______

 Reduction of NO₃⁻ to NH₄⁺

 Conversion of NO₃⁻ to N₂

 Conversion of organic N to NH₄⁺

 Oxidation of NH₄⁺ to NO₃⁻

4. Rhizosphere microbes influence _______

 Nutrient uptake

 Plant growth

 All of these

 Soil health

5. High exchangeable sodium percentage in soil results in _______

 Improved aggregate stability

 Enhanced macroporosity

 Dispersion of clay particles

 Flocculation of soil particles

6. The role of gypsum in acid soils is mainly to _______

 Neutralize acidity completely

 Supply calcium without altering pH

 Increase aluminum toxicity

 Reduce base saturation

7. Poor drainage conditions in soils enhance _______

 Leaching of soluble nutrients

 Soil aeration and oxygen diffusion

 Salt accumulation in the root zone

 Plant nutrient uptake efficiency

8. Ammonia oxidation in soil leads to _______

 Increase in pH

 Neutralization

 Decrease in soil pH

 No change in pH

9. A wide C:N ratio in organic residues generally results in _______

 Net nitrogen mineralization

 Ammonia volatilization

 Nitrogen immobilization

 Accelerated nitrification

10. Nitrogen volatilization from soils mainly results in the loss of _______

 Nitrite (NO₂⁻)

 Nitrate (NO₃⁻)

 Organic nitrogen

 Ammonia (NH₃)

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