1. In soil, microplastics can act as _______

 Nutrients

 Plant growth promoters

 Agent to induce gas exchange

 Pollutant carriers

2. Integrated nutrient management combines _______

 No inputs

 Organic and inorganic inputs

 Only chemical inputs

 Only organic inputs

3. The natural formation of carbonic acid in soil is due to _______

 Sulfur oxidation

 Nitrogen fixation

 Oxygen dissolution

 CO₂ reacting with water

4. In sodic soils, gypsum application mainly improves soil conditions by _______

 Dissolving organic matter

 Increasing soil acidity

 Replacing Na⁺ ions

 Neutralizing soil pH directly

5. In soil chemistry, gypsum acts as a _______ amendment

 Alkalizing

 Neutral salt

 Buffering agent

 Acidifying

6. Soil fertility refers to the soil’s capacity to _______

 Determine soil color characteristics

 Retain only water for plant use

 Control soil textural class

 Supply essential nutrients to plants in available forms

7. Which fertilizer type most strongly accelerates soil acidification upon repeated application?

 Nitrate-based fertilizers

 Potassium-based fertilizers

 Phosphate-based fertilizers

 Ammonium-based fertilizers

8. Which condition promotes the displacement of base cations from exchange sites?

 High rainfall and leaching

 Low rainfall

 High base saturation

 Dry conditions

9. Nutrient recycling reduces _______

 Waste accumulation

 Crop yield

 Soil fertility

 Water retention

10. Gypsum application helps reduce aluminum toxicity by _______

 Increasing soil pH rapidly

 Leaching Al³⁺ from exchange sites

 Binding phosphorus strongly

 Increasing H⁺ concentration

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Soil Chemical Properties MCQs

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