Soil Science 2

50 Questions | Total Attempts: 1263

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Soil Science 2 - Quiz

For all Geology and geography lovers who have vast interest in Soil Science, try out this quiz. It will gauge how much knowledge you really have about soil. All the best as you challenge yourself.


Questions and Answers
  • 1. 
    Which activity does not promote aggregation?
    • A. 

      Wet-dry

    • B. 

      Freeze-thaw

    • C. 

      Organic secretions

    • D. 

      Sodium adsorption

  • 2. 
    A landscaping contractor wants to change the texture of a silt loam soil to meet the specifications for a loam.  S/he would most likely do so by adding
    • A. 

      Clay

    • B. 

      Compost

    • C. 

      Humus

    • D. 

      Sand to the soil and mixing it well

  • 3. 
    In many soil profiles, the subsoil is high in clay, but is also quite permeable to percolating water.  Why?
    • A. 

      Prismatic structure may be well developed.

    • B. 

      The subsoil may have an organic texture.

    • C. 

      The water table may be present in the subsoil.

    • D. 

      Clay generally promotes free water movement.

  • 4. 
    These particles behave as colloids; meaning if suspended in water they don't readily settle out.
    • A. 

      Silt

    • B. 

      Clay

    • C. 

      Sand

  • 5. 
    This constituent is described as feeling smooth or flourlike.
    • A. 

      Clay

    • B. 

      Sand

    • C. 

      Silt

  • 6. 
    Fungal hyphae have an important influence on soil structure because they ___________.
    • A. 

      Stabilize macro aggregates

    • B. 

      Help to flocculate the soil colloids

    • C. 

      Create large channels that enhance water flow and aeration

    • D. 

      Are active in the formation of soil crusts

  • 7. 
    Using a textural triangle chart, it can be determined that a soil with 45% sand and 20% clay belongs to the ________ textural class.
    • A. 

      Sandy clay

    • B. 

      Loam

    • C. 

      Sandy loam

    • D. 

      Loamy sand

    • E. 

      Sandy clay loam

  • 8. 
    This constituent gives the highest aeration quality to a soil.
    • A. 

      Silt

    • B. 

      Sand

    • C. 

      Clay

  • 9. 
    Which type of soil structure is typically found in surface soil (A horizons)?
    • A. 

      Granular

    • B. 

      Columnar

    • C. 

      Sub-angular blocky

    • D. 

      Prismatic

    • E. 

      Platy

  • 10. 
    A friable soil is usually more likely to be indurated.
    • A. 

      True

    • B. 

      False

  • 11. 
    In texture by feel methods, this component accounts for longer ribbon formation.
    • A. 

      Clay

    • B. 

      Sand

    • C. 

      Silt

  • 12. 
    Practices that add organic matter and reduce tillage can be expected to most significantly increase the _______ in a soil.
    • A. 

      Macropores

    • B. 

      Bulk density

    • C. 

      Total porosity

    • D. 

      Fineness of texture

  • 13. 
    USDA considers this particle to be between .002 and .05mm.
    • A. 

      Silt

    • B. 

      Sand

    • C. 

      Clay

  • 14. 
    Soil tilth refers to _____________.
    • A. 

      The physical suitability of a soil or plant growth

    • B. 

      Ratio of bulk density to particle density

    • C. 

      Micro-aggregates produced as a by-product of tillage

    • D. 

      The moisture content at which a soil is best suited for tillage

    • E. 

      The bearing strength of a soil under a given downward force

  • 15. 
    Soil colors are scientifically described by ________ color designations such as 10YR3/4.
    • A. 

      Parson's

    • B. 

      Structural

    • C. 

      Wavelength

    • D. 

      USDA

    • E. 

      Munsell

  • 16. 
    Flocculation is a result of _____________.
    • A. 

      The interaction of clay and silt

    • B. 

      The shape of clay particles

    • C. 

      The interaction of polyvalent cations and clay platelets

    • D. 

      The interaction of sodium and negatively charged clay particles

  • 17. 
    A chroma greater than 4 generally indicates a soil in good tilth.
    • A. 

      True

    • B. 

      False

  • 18. 
    Dull gray colors are characterized by __________.
    • A. 

      High chromas

    • B. 

      Low values

    • C. 

      Low chromas

    • D. 

      High values

  • 19. 
    Which color would be typical of a well drained, low-organic matter sandy surface soil?
    • A. 

      7.5YR2/2

    • B. 

      2.5YR6/1

    • C. 

      7.5YR6/2

    • D. 

      10YR5/8

    • E. 

      10YR8/4

  • 20. 
    USDA considers this particle to be between .05mm and 2mm.
    • A. 

      Clay

    • B. 

      Silt

    • C. 

      Sand

  • 21. 
    Which of the following hues is the yellowest?
    • A. 

      7.5YR

    • B. 

      5YR

    • C. 

      10R

    • D. 

      10YR

    • E. 

      2.5YR

  • 22. 
    If a dry soil high in certain types of ________ is moistened, it is likely to swell up with enough force to crack pavements and building foundations.
    • A. 

      Iron

    • B. 

      Silt

    • C. 

      Humus

    • D. 

      Clay

  • 23. 
    ________ is not one of the textural classes.
    • A. 

      Silt

    • B. 

      Loam

    • C. 

      Sand

    • D. 

      Sandy silt

    • E. 

      Clay

  • 24. 
    Which of the following characteristics of deeper soil profiles is not a cause of higher bulk density in those deeper soil profiles?
    • A. 

      Less biota

    • B. 

      Less organic matter content

    • C. 

      Compaction caused by the weight of overlaying layers

    • D. 

      Higher soil chemoentrophothy

    • E. 

      Less aggregation

  • 25. 
    Which textural element is most important in soil aggregation?
    • A. 

      Clay

    • B. 

      Sand

    • C. 

      Silt