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Soil Science Practice Test for Agriculture Examinations

ByAditya Abhishek

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

In this test, you have to attempt 100 questions from the 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 Practice Test

Crop Science Practice Test

1. In the USDA soil taxonomy, which diagnostic surface horizon is characterized by high organic matter and forms under wetland conditions?

2. Which soil-forming process is responsible for the downward movement of silicate clay, iron, or organic matter from the upper to lower horizons?

3. Which horizon is commonly used as a diagnostic subsurface horizon in Alfisols?

4. What is the primary mineral form of phosphorus in weathered tropical soils like those in the Philippines?

5. Which laboratory method is commonly used in the Philippines to determine soil texture by particle size analysis?

6. What is the key distinguishing feature of Ultisols in the USDA soil taxonomy?

7. Which soil property is directly measured to determine lime requirement?

8. What does the term “soil colloids” primarily refer to?

9. Which of the following best describes the term “CEC” in soil chemistry?

10. Which form of potassium is directly available for plant uptake?

11. What is the ideal soil pH range for most agricultural crops?

12. In a soil profile, which horizon is typically enriched with leached materials?

13. Which factor is considered passive in Jenny’s equation of soil formation?

14. Which Philippine soil series is classified under Vertisols and known for its shrink-swell capacity?

15. What form of nitrogen is produced first during the process of mineralization of organic matter?

16. What is the effect of excessive sodium on soil structure?

17. What is the role of gypsum in reclaiming sodic soils?

18. Which enzyme is commonly used as a biological indicator of soil health?

19. Which of the following nutrients is most likely to become unavailable in alkaline soils?

20. What is the main reason for the red and yellow color in tropical soils?

21. In the hydrometer method of soil texture analysis, what does the reading at 40 seconds represent?

22. What is the primary difference between entisols and inceptisols?

23. Which of the following has the highest cation exchange capacity (CEC)?

24. What is the main function of mycorrhizae in soil?

25. Which Philippine agency is responsible for issuing official soil survey reports?

26. What is the function of iron oxides in tropical soils?

27. In acid sulfate soils, which toxic compound is commonly produced under oxidation?

28. What does a high SAR (Sodium Adsorption Ratio) value indicate in irrigation water?

29. What does the term “pF value” in soil moisture studies refer to?

30. Which form of phosphorus is considered most available to plants?

31. What is the process by which soluble salts accumulate in the soil profile due to poor drainage?

32. Which soil order is characterized by volcanic ash and is common in highland regions of the Philippines?

33. What is the term for the natural arrangement of soil particles into aggregates?

34. What is the diagnostic horizon of a spodic soil?

35. Which nutrient deficiency is indicated by interveinal chlorosis in young leaves?

36. Which soil amendment is commonly used to reclaim sodic soils?

37. What is the most common method of measuring soil bulk density in the field?

38. What is the term for the water held tightly by soil particles and unavailable to plants?

39. Which diagnostic horizon is characterized by high organic matter and base saturation?

40. What is the buffering capacity of a soil primarily influenced by?

41. Which soil horizon is primarily responsible for leaching in the soil profile?

42. What does the term “soil consistency” refer to?

43. What is the typical pH range for most agricultural crops to thrive?

44. Which method is commonly used to determine available phosphorus in acidic soils?

45. What does a high base saturation in soil indicate?

46. Which of the following processes is responsible for the development of laterite soils in the tropics?

47. Which of the following is NOT a primary mineral found in soil?

48. What is the main cause of acidification in agricultural soils?

49. What is the typical color of soils rich in organic matter?

50. Which Philippine soil series is best suited for irrigated lowland rice production?

51. What is the function of mycorrhizal fungi in soil?

52. Which clay mineral has a 2:1 layer structure and high swelling capacity?

53. What does the term “soil porosity” refer to?

54. Which nutrient is considered mobile in the soil and easily lost by leaching?

55. What is the method used to determine soil texture in the laboratory?

56. Which soil property influences nutrient retention the most?

57. Which of the following is considered a micronutrient for plant growth?

58. Which soil amendment is primarily used to raise the pH of acidic soils?

59. What is the main role of humus in the soil?

60. What is the term for soils with high amounts of sodium and poor structure?

61. Which laboratory method is used to determine soil organic carbon?

62. Which form of potassium is readily available to plants?

63. What does SAR (Sodium Adsorption Ratio) indicate in soil analysis?

64. Which element is typically deficient in calcareous soils?

65. What is the major form of sulfur taken up by plants?

66. What is the color of a soil with good drainage and high iron oxidation?

67. Which Philippine government agency is responsible for soil survey and classification?

68. What does the term “pedon” refer to in soil science?

69. Which soil diagnostic horizon is rich in organic matter and found at the top?

70. What does the term “field capacity” refer to in soil water terminology?

71. What is the primary effect of soil compaction on plant growth?

72. Which of the following best describes a spodic horizon?

73. Which parent material originates from volcanic ash?

74. Which soil moisture condition is most suitable for seed germination?

75. What is the role of gypsum in reclaiming sodic soils?

76. Which diagnostic horizon is characterized by significant clay illuviation?

77. What is the primary process responsible for soil acidification in tropical soils?

78. Which soil amendment is used to improve saline soil condition?

79. Which of the following is a major factor influencing soil formation in upland areas?

80. Which fertilizer is most acid-forming when applied continuously?

81. What is the term for the downward movement of clay particles from upper to lower horizons?

82. Which horizon typically shows evidence of eluviation?

83. What does bulk density of soil primarily influence?

84. Which micronutrient becomes more available in acidic soils?

85. What is the key feature of vertisols?

86. Which of the following is considered a residual parent material?

87. What process causes the accumulation of soluble salts at the surface?

88. What is the main factor affecting soil color?

89. Which clay mineral is least active in terms of cation exchange capacity?

90. In a soil textural triangle, what are the three main components used to determine soil texture?

91. Which property is used to classify soil as saline, sodic, or saline-sodic?

92. Which element is responsible for the reddish color in tropical soils?

93. Which Philippine soil order is commonly found in upland volcanic areas?

94. What is the process of nutrient movement towards plant roots due to water uptake called?

95. Which of the following is a product of mineral weathering in soil formation?

96. Which of the following soil organisms is most effective in decomposing cellulose?

97. What is the typical pH range of most productive agricultural soils?

98. Which soil enzyme is associated with phosphorus mineralization?

99. Which practice enhances the physical condition of soil and promotes root growth?

100. Which factor does not significantly affect cation exchange capacity (CEC) of soil?

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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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