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MCQs On Soil Science For Agriculture Examinations

ByAditya Abhishek

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.

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!

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Soil Science MCQsr

1. The mineral fraction of the soil that determines its texture and influences water retention and drainage is mainly composed of:

2. Which soil horizon is commonly referred to as the zone of eluviation due to leaching of clay, iron, or organic matter?

3. The cation exchange capacity (CEC) of a soil is primarily influenced by the amount and type of:

4. In highly weathered tropical soils, the dominant type of clay mineral is usually:

5. The nitrogen-fixing bacteria *Rhizobium* are primarily associated with which group of plants?

6. The process by which nitrate is converted to gaseous nitrogen (N₂) or nitrous oxide (N₂O) under anaerobic conditions is known as:

7. Which of the following soil conservation practices involves planting across the slope to reduce erosion and runoff?

8. The primary cause of soil acidity in upland areas of the Philippines is:

9. Which soil property is most directly affected by the application of lime to acidic soils?

10. The type of soil structure most desirable for good seedbed preparation and plant growth is:

11. The negatively charged particles in soil that adsorb cations and contribute to Cation Exchange Capacity (CEC) are known as:

12. Among the following clay minerals, which has the highest cation exchange capacity (CEC)?

13. In soils, the ratio of exchangeable bases to the total cation exchange capacity, expressed as a percentage, is known as:

14. A soil with a pH of 4.8 can be classified as:

15. When lime is applied to acidic soil, the neutralization reaction primarily involves the conversion of:

16. A soil is considered saline when its electrical conductivity (EC) of the saturation extract exceeds:

17. Gypsum (CaSO₄·2H₂O) is commonly applied to sodic soils mainly to:

18. In nutrient transformations, the conversion of ammonium (NH₄⁺) to nitrate (NO₃⁻) under aerobic conditions is known as:

19. The buffering capacity of soil is primarily due to the presence of:

20. The sodium adsorption ratio (SAR) is a useful indicator in evaluating:

21. The type of soil survey that provides general information about large areas and is commonly used for regional planning is known as:

22. In a detailed soil survey, the scale of the base map commonly used is approximately:

23. In the USDA Soil Taxonomy, the highest category in the soil classification hierarchy is the:

24. The soil order that is characterized by high organic matter accumulation under wet, anaerobic conditions is known as:

25. In the FAO soil classification system, the term “Leptosols” refers to soils that are:

26. The Philippine soil classification system is primarily based on:

27. In a soil survey report, a “mapping unit” refers to:

28. Which soil order is dominant in volcanic regions of the Philippines such as Bukidnon and Batangas?

29. In land capability classification, lands belonging to Class VIII are generally suitable for:

30. The most suitable land use for Class II lands according to the USDA Land Capability Classification is:

31. Which of the following elements is classified as a secondary macronutrient essential for plant growth?

32. The primary function of potassium (K) in plants is to:

33. Deficiency of which micronutrient commonly causes interveinal chlorosis in young leaves of crops like maize and rice?

34. Which nutrient deficiency leads to “whip-tail” disorder in cauliflower?

35. The process by which nitrogen is lost from the soil as ammonia gas is known as:

36. The conversion of ammonium (NH₄⁺) to nitrate (NO₃⁻) in soil is called:

37. Which of the following fertilizers contains nitrogen in both ammoniacal and nitrate forms?

38. Soil test values are generally expressed in which unit to indicate nutrient availability?

39. Integrated Nutrient Management (INM) primarily aims to:

40. Which nutrient is most susceptible to leaching losses in humid tropical soils due to its high solubility?

41. Which of the following clay minerals has the highest cation exchange capacity (CEC)?

42. The property of soil that allows it to resist sudden changes in pH when acids or bases are added is called:

43. The primary source of negative charge in 2:1 clay minerals such as smectite is due to:

44. The exchangeable sodium percentage (ESP) of a soil is used to indicate:

45. A soil with pH above 8.5, poor structure, and high sodium content is classified as:

46. The most suitable amendment for reclaiming sodic soils is:

47. The pH range in which most essential plant nutrients are optimally available is:

48. In saline soils, the electrical conductivity (ECe) of the saturated paste extract is greater than:

49. The measure of total cations that a soil can adsorb per unit weight is known as:

50. Which compound is commonly used to correct soil acidity and increase base saturation?

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To learn N-P-K Computations, try checking out our tool: NPK Calculator

Aditya Abhishek has completed Bachelor Of Science in Agriculture from SDSUV, Uttarakhand. He focuses on learning and delivering knowledge on Agriculture and Home Gardening. He created Agriculture Review as a common platform for all nature enthusiast to learn better practices of agriculture, gardening & shop quality products & services.

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