Soil Science One Liner Questions for ICAR, CUET, AFO (2026)

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Soil Science One Liner Questions (ICAR/CUET/AFO) 2026

If you are preparing for ICAR UG, ICAR JRF/SRF, CUET PG, UPSC AFO, RAEO, ADA, AAO, then these Soil Science one liner questions are highly important for revision and MCQ exams.

✅ Quick Highlights

  • Best for last-minute revision

  • Covers high repeated concepts

  • Useful for ICAR + State exams

  • Includes exam-focused facts

  • Designed for MCQ scoring

✅ 1. Most Important Soil Science One Liners

(A) Soil Formation & Properties

  1. Study of soil is called Pedology.

  2. Study of soil fertility and plant nutrition is Edaphology.

  3. Soil is a dynamic natural body.

  4. Soil pH < 7 indicates acidic soil.

  5. Soil pH > 7 indicates alkaline soil.

  6. Neutral soil pH is 7.0.

  7. Soil organic matter mainly improves water holding capacity.

  8. Soil texture depends on sand, silt and clay.

  9. Most fertile soil texture is loam.

  10. Bulk density generally increases with compaction.

(B) Soil Water & Soil Air

  1. Field capacity is water content after gravitational water drains out.

  2. Permanent wilting point is moisture content at which plants cannot recover.

  3. Available water = FC – PWP.

  4. Capillary water is mostly available to plants.

  5. Gravitational water is not available.

  6. Soil aeration is best in sandy soil.

  7. Soil water potential is expressed in bars/MPa.

(C) Soil Fertility & Nutrients

  1. Essential nutrient concept was given by Arnon & Stout.

  2. Total essential plant nutrients are 17 (as commonly accepted in modern syllabus).

  3. Nitrogen is absorbed mainly as NO₃⁻ and NH₄⁺.

  4. Phosphorus is absorbed as H₂PO₄⁻ / HPO₄²⁻.

  5. Potassium is absorbed as K⁺.

  6. Calcium is absorbed as Ca²⁺.

  7. Magnesium is absorbed as Mg²⁺.

  8. Sulphur is absorbed as SO₄²⁻.

(D) Soil Reaction (pH) & Problem Soils

  1. Acid soils are common in high rainfall regions.

  2. Liming material commonly used: CaCO₃.

  3. Sodic soil reclamation material: Gypsum (CaSO₄·2H₂O).

  4. Saline soil pH is usually < 8.5.

  5. Sodic soil pH is usually > 8.5.

✅ 2. Soil Science Most Expected MCQs (2026)

Q1. Soil science is mainly divided into:

A) Pedology and Edaphology ✅
B) Hydrology and geology
C) Morphology and taxonomy
D) None

Q2. Which soil has highest water holding capacity?

A) Sandy
B) Loamy
C) Clayey ✅
D) Gravel

Q3. Soil texture is determined by:

A) Organic carbon
B) Sand, silt, clay ✅
C) Fertility level
D) Soil colour

Q4. Nutrient absorbed as nitrate form:

A) Phosphorus
B) Nitrogen ✅
C) Potassium
D) Calcium

Q5. Gypsum is used for reclamation of:

A) Acid soil
B) Saline soil
C) Sodic soil ✅
D) Peaty soil

(If you want I can extend this MCQ set to 50–100 questions daily.)

✅ 3. Soil Science FAQ (Ranking Booster)

Q1. What is the most fertile soil texture?

✅ Loam soil

Q2. What is the normal pH range of soil?

✅ 6.5 to 7.5

Q3. Which form of nitrogen is absorbed by plants?

✅ NO₃⁻ and NH₄⁺

Q4. What is the difference between saline and sodic soil?

✅ Saline: EC high, pH < 8.5
✅ Sodic: ESP high, pH > 8.5

Q5. Best material for sodic soil reclamation?

✅ Gypsum

✅ Conclusion

These Soil Science one liner questions + MCQs are very useful for ICAR UG/JRF, CUET PG, UPSC AFO and State Agriculture exams. Save this page and revise again before exam.

✅ For more daily notes/MCQs, visit: Agriculture RS Rajput

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