| |

Soil Science Review Questions for LEA, MCQs with Key Answers

Byआदित्य अभिषेक

Hey students, preparing for your upcoming agriculture examinations such as PRC LEA, UPSC, ICAR JRF, etc. but confused about whether your preparation is going well or not? Well, no more! At Agriculture Review, we keep updating new test series daily based on previous years’ questions of the Examination for Agriculturists.

In this test, you have to attempt 50 questions from Soil Science subject. Attempting all questions is necessary to identify your strengths and weaknesses. After completing the test, you can take a screenshot of your result for future reference and compare it with past performances. To stay updated with regular test series, click on the bell icon at the bottom left corner of the screen.

📘 How to Attempt These LEA Based MCQs

Follow these simple steps to simulate exam conditions, boost accuracy, and learn from mistakes effectively.

  1. Read each question carefully. Look for keywords like “primary,” “most common,” या “best suited.”
  2. Use the elimination method. Cross out obviously wrong options first to narrow choices.
  3. Time management: Aim for 1 minute per question (total 50 minutes). Mark hard questions and return to them later.
  4. Think conceptually. LEA questions often test application — ask yourself why an answer fits.
  5. Keep calculations minimal. Most MCQs are conceptual; when calculations appear, write steps clearly.
  6. After finishing, review answers. Check the answer key only after completing the whole test to assess time and accuracy.
  7. Create a revision list. Note down topics you missed and review them in short, focused sessions.
Quick tips:
  • Answer easy questions first to secure marks quickly.
  • For disease questions, remember causative agents (virus/bacteria/protozoa) and prevention methods (vaccination/biosecurity).
  • Memorize common breeds, top-producing regions, and key lab tests (e.g., CMT for mastitis).

Tip: Repeat the quiz weekly and track progress. Consistent practice beats last-minute cramming.

You can also join our Facebook Broadcast Channel, where we regularly share newly updated questions. All the best for today—I hope you become a registered Agriculturist soon!

JOIN BROADCAST CHANNEL

यदि आपका कोई प्रश्न, विचार या सुझाव है तो कृपया नीचे टिप्पणी करें। आप फेसबुक, इंस्टाग्राम, कू और व्हाट्सएप मैसेंजर पर भी एग्रीकल्चर रिव्यू से जुड़ सकते हैं।

soil-science-review-questions-for-lea

Soil Science Review Questions

1. Which of the following elements is classified as a secondary macronutrient essential for chlorophyll formation and enzyme activation in plants?

2. The criteria of essentiality of plant nutrients were proposed by Arnon and Stout in which year?

3. Phosphorus availability to plants is maximum when soil pH is approximately within the range of:

4. Which of the following fertilizers is classified as a complex fertilizer supplying both nitrogen and phosphorus?

5. Nitrogen in the form of ammonium (NH₄⁺) is more likely to be lost from the soil through which process under anaerobic conditions?

6. Calcitic lime primarily provides which nutrient element to the soil during neutralization of acidity?

7. Which clay mineral generally exhibits the highest cation exchange capacity (CEC)?

8. The soil condition characterized by high sodium adsorption ratio (SAR) and poor structure is referred to as:

9. Boron deficiency in plants typically leads to which visible symptom?

10. In soil taxonomy, soils that are newly formed with little profile development are classified as:

11. The release of ammonium from organic matter during decomposition is termed as:

12. In acid soils with pH below 5.0, phosphorus is primarily fixed by which of the following compounds?

13. The fertilizer grade “14–14–14” indicates that the fertilizer contains:

14. When ammonium sulfate [(NH₄)₂SO₄] is continuously applied to soil, what is the most probable long-term effect?

15. Among the following, which nutrient is highly mobile in plants but relatively immobile in soil, leading to frequent foliar application?

16. The gypsum requirement of a sodic soil is primarily determined to replace which cation from the exchange complex?

17. Among the following soils, which is expected to exhibit the lowest cation exchange capacity (CEC)?

18. The plant symptom known as “whip-tail” in cauliflower is due to deficiency of which micronutrient?

19. In the cation exchange process, the replacement of one cation by another on the colloidal surface occurs primarily by:

20. Among the following soil orders, which typically shows strong accumulation of iron and aluminum oxides, characteristic of highly weathered tropical soils?

21. A soil sample has a bulk density of 1.40 g cm-3 and a particle density of 2.65 g cm-3. What is the approximate total porosity of the soil (percent)?

22. Which soil textural class typically has the highest plant-available water capacity (AWC) per unit depth and is therefore often recommended for water-efficient cropping?

23. A high plasticity index (PI) and pronounced shrink–swell behavior in a soil profile are most characteristic of which clay mineral group?

24. Which laboratory procedure is most commonly used to quantify soil aggregate stability against rapid wetting and breakdown (an index of structural resilience)?

25. Which soil texture is expected to have the highest saturated hydraulic conductivity (Ksat) under similar bulk density conditions?

26. In the Munsell colour system, a soil horizon showing very low chroma values (e.g., 1 or 2) and grayish hues most likely indicates which soil condition?

27. Soil compaction caused by heavy machinery most directly results in which of the following changes to soil physical properties?

28. Which surface condition most commonly causes a sharp reduction in infiltration rate immediately after a heavy rain event?

29. For fine-textured soils (<2 mm fraction), which laboratory method is most appropriate for determining particle size distribution (sand, silt, clay) including the dispersion of clay?

30. In an unsaturated upland soil under typical cropping conditions, which component of soil water potential usually dominates plant water uptake behavior?

31. The acidity that is directly measured in the soil solution by a pH meter is referred to as:

32. Which of the following statements about soil buffering capacity is TRUE?

33. Dolomitic limestone is preferred over calcitic lime when:

34. A saline soil is characterized by an electrical conductivity (EC) of the saturation extract greater than:

35. Which index is used to indicate the relative proportion of sodium to calcium and magnesium in soil solution that affects soil structure stability?

36. The gypsum requirement of sodic soils is mainly based on which of the following chemical reactions?

37. Excess exchangeable sodium in soils generally causes which of the following physical effects?

38. The soil pH at which maximum nutrient availability occurs for most field crops is approximately:

39. Which of the following is NOT a typical characteristic of sodic soils?

40. Which of the following management practices is least effective in reclaiming saline soils?

41. The decomposition of crop residues and organic matter in soil is primarily accelerated by:

42. In the soil carbon cycle, which of the following microbial processes converts organic nitrogen into ammonium (NH4+)?

43. The C:N ratio of organic residues most favorable for rapid mineralization and release of plant-available nitrogen is approximately:

44. Which group of microorganisms is primarily responsible for biological nitrogen fixation in association with legumes?

45. A soil with a dark A horizon rich in humus overlying a clay-rich B horizon developed under grassland vegetation is most likely classified as a/an:

46. Which soil-forming process involves the downward movement of clay and other materials from the upper to the lower horizons?

47. Andisols, a common soil order in volcanic regions of the Philippines, are mainly characterized by:

48. Which soil order typically exhibits vertic properties such as deep cracks and self-mulching behavior during wetting and drying cycles?

49. Which soil horizon is primarily composed of partially decomposed organic matter found at the soil surface in forested ecosystems?

50. In the USDA Soil Taxonomy, the classification hierarchy from the most general to the most specific is:

Your Quiz Result

Share your score!

To learn N-P-K Computations, try checking out our tool: एनपीके कैलकुलेटर

आदित्य अभिषेक ने एसडीएसयूवी, उत्तराखंड से कृषि में स्नातक की पढ़ाई पूरी की है। वह कृषि और गृह बागवानी पर सीखने और ज्ञान प्रदान करने पर ध्यान केंद्रित करते हैं। उन्होंने कृषि, बागवानी और दुकान की गुणवत्ता वाले उत्पादों और सेवाओं की बेहतर प्रथाओं को सीखने के लिए सभी प्रकृति उत्साही लोगों के लिए एक सामान्य मंच के रूप में एग्रीकल्चर रिव्यू बनाई।

Similar Posts

प्रातिक्रिया दे

आपका ईमेल पता प्रकाशित नहीं किया जाएगा. आवश्यक फ़ील्ड चिह्नित हैं *