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Soil Science MCQ: Soil Formation & Soil Profile

Byआदित्य अभिषेक

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Soil Science MCQ: Soil Formation & Soil Profile

1. Soil formation that occurs from the breakdown of parent material through weathering and the influence of environmental factors over time is termed:

2. Which soil horizon is primarily composed of organic matter in various stages of decomposition?

3. A soil with high organic carbon content, low bulk density, and excellent water retention is most characteristic of:

4. An edaphologist primarily focuses on soil as a:

5. Soil texture refers to the relative proportion of which soil separates?

6. Soil structure that promotes good aeration and water infiltration is commonly described as:

7. Bulk density of a soil is defined as the mass of dry soil per unit:

8. In a coastal saline soil, the major limitation to crop growth is primarily due to:

9. Which soil horizon is typically enriched with clay, iron, or aluminum relative to overlying horizons?

10. Compared to upland soils, soils used for irrigated rice production generally require:

11. Which factor of soil formation primarily explains the development of highly weathered tropical soils such as Oxisols?

12. In tropical soil profiles, intense leaching commonly results in the accumulation of iron and aluminum oxides in which horizon?

13. Which statement best distinguishes mineral soils from organic soils?

14. The horizon characterized by eluviation (loss of clay, iron, or organic matter) is designated as:

15. Particle density of most mineral soils commonly approximates:

16. Which soil texture class generally provides the best balance of aeration, drainage, and water-holding capacity for most upland crops?

17. A soil exhibiting high bulk density is most likely to show:

18. Which structural type is most commonly observed in compacted subsoils and restricts vertical water movement?

19. Which physical condition makes saline coastal soils unsuitable for many crops even when moisture is present?

20. For puddled soils used in irrigated rice systems, which physical characteristic is intentionally increased to minimize percolation losses?

21. Which process best explains the downward movement of fine clay particles from upper horizons to lower horizons in a soil profile?

22. Which combination of soil-forming factors is MOST responsible for shallow soil profiles on steep slopes?

23. Which property most directly differentiates soil texture from soil structure?

24. Which horizon typically represents partially weathered parent material?

25. In tropical environments, rapid organic matter decomposition is mainly attributed to:

26. Which soil condition is MOST favorable for puddling during rice land preparation?

27. Which measurement is required to compute total soil porosity?

28. Which soil horizon is usually darkest in color due to accumulated organic matter?

29. Which physical limitation is MOST common in compacted agricultural soils?

30. Which soil-forming process results in accumulation of salts near the surface in arid and semi-arid regions?

31. Which soil-forming factor MOST directly controls the rate of chemical weathering in tropical regions?

32. Which soil physical property MOST influences root penetration resistance?

33. A soil profile showing distinct A, E, and B horizons most likely formed under which condition?

34. Which soil structure is typically associated with surface horizons rich in organic matter?

35. Which physical condition BEST explains why clay soils retain more water than sandy soils?

36. Which horizon is absent in many young soils due to insufficient time for profile development?

37. Which soil condition MOST limits oxygen diffusion to plant roots?

38. Which process dominates soil profile development in permanently flooded lowland rice fields?

39. Which physical change usually results from repeated puddling of rice soils?

40. Which soil characteristic MOST indicates advanced weathering in tropical soils?

41. Which soil-forming process is characterized by intense leaching of bases and silica, leaving behind iron and aluminum oxides in humid tropical climates?

42. Which physical soil property MOST directly controls the rate of water infiltration?

43. Which horizon typically shows the greatest biological activity?

44. Which condition MOST favors the formation of platy soil structure?

45. Which property explains why sandy soils warm faster than clay soils?

46. Which soil horizon directly overlies bedrock?

47. Which condition is MOST indicative of organic soils?

48. Which physical limitation is MOST likely in reclaimed coastal soils?

49. Which property remains essentially constant regardless of soil compaction?

50. Which feature BEST distinguishes pedology from edaphology?

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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।

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