Question 1

Earthworms

Accepted Answer

A)   are widely distributed over the Earth.
B)   are known by the Latin name Bubulcus ibis.
C)   usually deplete soil fertility.
D)   excrete casts.
E)   are correctly described by all of the above

Question 2

Mollisols and__________ are the two most agriculturally productive soil orders.

Accepted Answer

A)   Oxisole
B)   Alfisols
C)   Vertisols
D)   Inceptisols
E)   Entisols

Question 3

Which of the following horizons is found furthest from the surface of the soil?

Accepted Answer

A)   O
B)   B
C)   E
D)   R
E)   C

Question 4

Which pH reading is suitable for most plants and soil microorganisms?

Accepted Answer

A)   10
B)   7
C)   0
D)   3
E)   5

Question 5

The pedogenic regime associated with the tropical moist climates is______ .

Accepted Answer

A)   gleization
B)   podzolization
C)   salinization
D)   calcification
E)   laterization

Question 6

Which are the least well developed of all soil orders?

Accepted Answer

A)   Alfisols
B)   Vertisol
C)   Entisols
D)   Oxisols
E)   Mollisols

Question 7

The lowest level of the Soil Taxonomy soil classification system is the_________ .

Accepted Answer

A)   family
B)   caton
C)   subgroup
D)   series
E)   group

Question 8

________is least available to plants because it is held in chemical combination with the minerals in the soil.

Accepted Answer

A)   Combined water
B)   Free water
C)   Capillary water
D)   Hygroscopic water
E)   Gravitational water

Question 9

After gravitational water has drained away, _________ is the water that remains in the soil and is available for use by plants.

Accepted Answer

A)   hygroscopic water
B)   capillary water
C)   water of cohesion
D)   groundwater
E)   free water

Question 10

The size groups within the standard classification of soil particle sizes are termed ________.

Accepted Answer

A)   cations
B)   epipedons
C)   humus
D)   pedons
E)   separates

Question 11

The cation exchange capacity is most closely associated with________ .

Accepted Answer

A)   regolith
B)   color
C)   silt
D)   sand
E)   colloids

Question 12

The mixing of soil materials by the activities of animals is known as________ .

Accepted Answer

The answer of The mixing of soil materials by the...

Question 13

In terms of topography, the deepest soils

Accepted Answer

A)   are where erosion is fastest.
B)   are on steep hills with sandstone bedrock.
C)   are on flat land.
D)   are on the sides of hills.
E)   can be found in any of the above locations.

Question 14

Charles Darwin concluded the most important animal to the history of the world is the _ _________.

Accepted Answer

A)   cat
B)   earthworm
C)   lion
D)   mosquito
E)   elephant

Question 15

This type of water is held to soil particles by adhesion and is normally unavailable to plants:

Accepted Answer

A)   Gravitational water
B)   Hygroscopic water
C)   Capillary water
D)   Combined water
E)   all of the above

Question 16

Mollisols are, on the whole, the most ________ of all soil orders.

Accepted Answer

A)   polar
B)   neutral
C)   productive
D)   equatorial
E)   limited

Question 17

Distinctly alkaline diagnostic horizons, thin profiles, lack of organic material, and dominance of sandy materials are features most closely associated with which soil order?

Accepted Answer

A)   Aridosols
B)   Gelisols
C)   Andisols
D)   Mollisols
E)   Oxisols

Question 18

Which of the following is considered part of the soil?

Accepted Answer

A)   water
B)   air
C)   dead and rotting plant parts
D)   fine, fragmented mineral particles
E)   all of the above

Question 19

Which soil- forming factor is much more important than the others in "causing" the specific soil of a location?

Accepted Answer

A)   biological
B)   chronological
C)   geologic
D)   climatic
E)   none of the above

Question 20

Which of the following is NOT a property of soil clay?

Accepted Answer

A)   many chemical reactions occur on its surfaces
B)   colloidal in size
C)   occurs as thin laminar sheets
D)   it is able to hold water to itself
E)   made primarily of silt

Exam 12: Soils

This type of water is held to soil particles by adhesion and is normally unavailable to plants:

Correct AnswerverifiedShow Answer

Mollisols are, on the whole, the most ________ of all soil orders.

Correct AnswerverifiedShow Answer

Which of the following is NOT a property of soil clay?

Correct AnswerverifiedShow Answer

The size groups within the standard classification of soil particle sizes are termed ________.

Correct AnswerverifiedShow Answer

Mollisols and__________ are the two most agriculturally productive soil orders.

Correct AnswerverifiedShow Answer

The lowest level of the Soil Taxonomy soil classification system is the_________ .

Correct AnswerverifiedShow Answer

Which are the least well developed of all soil orders?

Correct AnswerverifiedShow Answer

Which soil- forming factor is much more important than the others in "causing" the specific soil of a location?

Correct AnswerverifiedShow Answer

Which of the following is considered part of the soil?

Correct AnswerverifiedShow Answer

Which of the following horizons is found furthest from the surface of the soil?

Correct AnswerverifiedShow Answer

The mixing of soil materials by the activities of animals is known as________ .

Correct AnswerverifiedShow Answer

The cation exchange capacity is most closely associated with________ .

Correct AnswerverifiedShow Answer

Which pH reading is suitable for most plants and soil microorganisms?

Correct AnswerverifiedShow Answer

After gravitational water has drained away, _________ is the water that remains in the soil and is available for use by plants.

Correct AnswerverifiedShow Answer

Charles Darwin concluded the most important animal to the history of the world is the _ _________.

Correct AnswerverifiedShow Answer

Earthworms

Correct AnswerverifiedShow Answer

________is least available to plants because it is held in chemical combination with the minerals in the soil.

Correct AnswerverifiedShow Answer

Distinctly alkaline diagnostic horizons, thin profiles, lack of organic material, and dominance of sandy materials are features most closely associated with which soil order?

Correct AnswerverifiedShow Answer

In terms of topography, the deepest soils

Correct AnswerverifiedShow Answer

The pedogenic regime associated with the tropical moist climates is______ .

Correct AnswerverifiedShow Answer

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