1. At high soil pH, iron (Fe) predominantly exists in _______ form

 Soluble

 Mobile

 Exchangeable

 Insoluble

2. The term “nutrient fixation” in soils refers to __________________

 Plant uptake of nutrients

 Conversion of nutrients into unavailable forms

 Leaching losses of nutrients

 Loss of nutrients through volatilization

3. Aluminum (Al³⁺) toxicity in acidic soils primarily affects _______

 Stem elongation

 Leaf photosynthesis

 Root growth

 Flowering

4. ________________  is the soil type most susceptible to rapid acidification

 Calcareous soil

 Sandy soil with low organic matter

 Clay-rich soil

 Organic-rich soil

5. Which soil component most strongly links cation exchange capacity (CEC) with soil pH?

 Gravel

 Clay and organic matter

 Sand

 Water

6. Active acidity in soils refers to _______

 H⁺ in the soil solution

 Al³⁺ on cation exchange sites

 Total soil acidity

 H⁺ adsorbed on clay surfaces

7. Ammonia (NH₃) volatilization from soils is highest under _______

 Acidic conditions

 Waterlogged conditions

 Neutral conditions

 Alkaline conditions

8. A decrease in soil pH from 7 to 5 indicates ______________________________

 20 times increase in acidity

 2 times increase in acidity

 1000 times increase in acidity

 100 times increase in acidity

9. Soils with low cation exchange capacity (CEC) are most prone to _______

 Rapid pH changes

 High inherent fertility

 High buffering capacity

 Strong nutrient retention

10. In calcareous soils, phosphorus (P) availability is primarily limited due to ______

 Al fixation

 Leaching

 Ca fixation

 Fe fixation

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Soil Chemical Properties MCQs

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