Hi, Agriculturist, Welcome to this Confidence Booster Test Series-C. To avoid missing notifications for test series, turn on notifications and subscribe to the newsletter. We upload new test series every day at 3:30 p.m. Therefore, prepare well before the time and attempt the test series carefully.

The code for this test series is : CBTS-SS-03; it will cover basic information on soil pH. After reading and memorizing the notes, you will be able to answer all the questions correctly. Let’s know your score once you have attempted all the questions. If you have not read the pdf notes, then do read them first, as this test series is intended to boost your confidence step by step.

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Agriculture Review Confidence Booster Test Series C

Question Code: : CBTS-SS-03

1. What does soil pH measure?

  • Soil’s temperature
  • Soil’s acidity or alkalinity
  • Soil’s organic content
  • Soil’s moisture level

2. What pH value is considered neutral?

  • 6.0
  • 7.0
  • 8.0
  • 9.0

3. What is the pH range preferred by most plants?

  • 4.0 to 5.0
  • 5.5 to 7.0
  • 7.0 to 8.0
  • 8.0 to 9.0

4. What kind of environment does a high positive Eh indicate?

  • Reducing environment
  • Oxidizing environment
  • Neutral environment
  • Alkaline environment

5. Which of the following ions are not retained by soil colloids?

  • Potassium (K+)
  • Ammonium (NH4+)
  • Calcium (Ca++)
  • Nitrate (NO3-)

6. What is Cation Exchange Capacity (CEC)?

  • The soil’s ability to retain water
  • The soil’s ability to retain cations
  • The soil’s acidity level
  • The soil’s organic content

7. Which of the following soils tend to have a higher CEC?

  • Sandy soils
  • Clay soils
  • Silty soils
  • Loamy soils

8. What does a low negative Eh indicate?

  • High oxidizing environment
  • Neutral environment
  • Strong reducing environment
  • Alkaline environment

9. Which element’s availability is most affected by soil pH between 6.0 and 7.5?

  • Nitrogen
  • Phosphorus
  • Potassium
  • Calcium

10. In the context of soil chemistry, what is the significance of redox potential (Eh)?

  • It measures soil temperature
  • It measures soil acidity
  • It indicates the soil’s tendency to oxidize or reduce substances
  • It measures soil moisture

11. How is the reduction potential (E0) of a species defined?

  • Relative to the standard hydrogen electrode
  • Relative to the standard oxygen electrode
  • As an absolute potential
  • As a fixed value of 1.0 volts

12. What happens to the acid content of soil when the pH is lowered from 6.5 to 5.5?

  • It increases 2-fold
  • It increases 5-fold
  • It increases 10-fold
  • It increases 100-fold

13. What is the role of buffering solution in the Buffer pH (BpH) test?

  • To increase soil acidity
  • To maintain pH stability
  • To simulate fast-acting lime
  • To measure soil moisture

14. Which ions are typically more soluble in acid soils?

  • Calcium and magnesium
  • Sodium and potassium
  • Iron and aluminum
  • Sulfate and chloride

15. Which nutrient is commonly associated with deficiencies in alkaline soils?

  • Nitrogen
  • Phosphorus
  • Iron
  • Potassium

16. Which factor most strongly influences soil pH?

  • Soil color
  • Soil temperature
  • Soil parent material
  • Soil texture

17. What is the main source of acidity in soils?

  • Carbon dioxide
  • Organic acids
  • Aluminum ions
  • Nitrate ions

18. Which process contributes to soil acidification?

  • Liming
  • Leaching of bases
  • Soil compaction
  • Soil erosion

19. Which ion exchange is considered an important reaction in the soil environment?

  • Ca2+ for Na+
  • Ca2+ for Mg2+
  • H+ for Ca2+
  • K+ for Na+

20. Which condition increases the concentration of hydrogen ions (H+) in soil?

  • Increasing pH
  • Decreasing pH
  • Adding lime
  • Adding organic matter

21. Which soil component contributes most to cation exchange capacity (CEC)?

  • Sand
  • Silt
  • Clay
  • Gravel

22. What is a common symptom of aluminum toxicity in plants?

  • Yellowing of leaves
  • Stunted root growth
  • Leaf curling
  • Wilting

23. Which soil pH level is considered highly alkaline?

  • 6.5
  • 7.5
  • 8.5
  • 9.5

24. How does soil pH affect microbial activity?

  • Low pH enhances microbial activity
  • Neutral pH favors microbial activity
  • High pH inhibits microbial activity
  • Low pH inhibits microbial activity

25. What is the function of soil organic matter?

  • It increases soil compaction
  • It improves soil structure
  • It decreases water retention
  • It reduces nutrient availability

26. Which soil amendment is used to lower pH in alkaline soils?

  • Lime
  • Gypsum
  • Sulfur
  • Compost

27. How does soil organic matter affect soil pH?

  • It increases pH
  • It decreases pH
  • It buffers pH changes
  • It has no effect on pH

28. Which gas is released during the reduction of nitrate in soils?

  • Oxygen
  • Nitrogen
  • Hydrogen
  • Carbon dioxide

29. What is the main source of nitrogen for plants?

  • Atmospheric nitrogen
  • Soil organic matter
  • Soil minerals
  • Irrigation water

30. Which form of nitrogen is most readily available to plants?

  • Nitrogen gas (N2)
  • Ammonium (NH4+)
  • Nitrate (NO3-)
  • Nitrite (NO2-)

31. Which process converts ammonium to nitrate in soils?

  • Nitrogen fixation
  • Denitrification
  • Mineralization
  • Nitrification

32. What is the significance of soil pH in nutrient availability?

  • pH has no effect on nutrient availability
  • pH only affects nitrogen availability
  • pH affects the availability of all nutrients
  • pH affects the availability of water

33. How does high soil pH affect phosphorus availability?

  • It increases phosphorus availability
  • It decreases phosphorus availability
  • It has no effect on phosphorus availability
  • It increases phosphorus leaching

34. What does a low soil pH indicate about the concentration of hydrogen ions (H+)?

  • Low concentration of H+
  • High concentration of H+
  • No H+ present
  • H+ concentration does not change

35. What is the primary effect of soil acidification on nutrient availability?

  • It increases the availability of all nutrients
  • It decreases the availability of all nutrients
  • It increases the availability of some nutrients and decreases others
  • It has no effect on nutrient availability

36. Which soil pH level is optimal for most crop plants?

  • 4.5 to 5.5
  • 5.5 to 6.5
  • 6.5 to 7.5
  • 7.5 to 8.5

37. Which element becomes more toxic as soil pH decreases?

  • Calcium
  • Magnesium
  • Aluminum
  • Potassium

38. What is the effect of liming on soil pH?

  • It decreases soil pH
  • It increases soil pH
  • It has no effect on soil pH
  • It neutralizes soil pH

39. Which soil property does the Buffer pH (BpH) test evaluate?

  • Soil texture
  • Soil moisture
  • Soil acidity
  • Soil organic matter

40. Which soil pH is considered optimal for legume crops?

  • 4.5 to 5.5
  • 5.5 to 6.5
  • 6.5 to 7.5
  • 7.5 to 8.5

41. Which ion is predominantly exchanged in the cation exchange process in acidic soils?

  • Sodium (Na+)
  • Calcium (Ca2+)
  • Hydrogen (H+)
  • Magnesium (Mg2+)

42. Which factor does not directly affect the redox potential (Eh) of soil?

  • Soil temperature
  • Soil moisture
  • Soil organic matter
  • Soil texture

43. Which ion is most commonly associated with soil salinity?

  • Nitrate (NO3-)
  • Calcium (Ca2+)
  • Sodium (Na+)
  • Magnesium (Mg2+)

44. Which process increases the alkalinity of soil?

  • Leaching of bases
  • Addition of organic matter
  • Application of ammonium-based fertilizers
  • Liming

45. Which element is typically more available in acidic soils compared to alkaline soils?

  • Calcium
  • Magnesium
  • Iron
  • Potassium

46. What is the effect of soil compaction on soil aeration?

  • It improves soil aeration
  • It decreases soil aeration
  • It has no effect on soil aeration
  • It only affects water retention

47. Which nutrient is often deficient in acidic soils?

  • Manganese
  • Copper
  • Zinc
  • Calcium

48. What is the primary cause of soil salinity?

  • Excessive irrigation
  • Heavy rainfall
  • Application of lime
  • Crop rotation

49. Which soil amendment is used to improve soil structure and water retention?

  • Sand
  • Gypsum
  • Peat moss
  • Compost

50. Which process decreases soil acidity?

  • Leaching of bases
  • Addition of organic matter
  • Application of sulfur
  • Liming

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