AnswersIC Environmental Science - DeeringTopic Test

Topic Test Answers

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41
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Victory gardens were used in World Wars I and II to augment the public food supply and aid the war effort.

A
T
B
F
42
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Soil structure and soil texture are essentially the same property of soil.

A
T
B
F
43

Which of the following is not true concerning cover crops?

A
they prevent soil erosion
B
they can fix nitrogen in soil
C
they are sold as cash crops
D
they add organic matter to soil
44

Why is volcanic soil (andisol) very fertile?

A
It is rich in minerals from volcanic deposits.
B
It is a young soil with low water retention.
C
It has been leached of mineral nutrients.
D
Volcanic activity warms the soil.
45

Which of the following properties of soil helps in absorbing contaminants from the soil?

A
cation-exchange capacity
B
soil reaction
C
soil structure
D
soil consistency
46

Permafrost (gelisol) is considered a hearty, robust soil type.

A
T
B
F
47

The presence of organic material in soil makes it more productive for plant growth.

A
T
B
F
48

Histosols experience a fast rate of decomposition. Please select the best answer from the choices provided

A
T
B
F
49

The same agricultural practices are used in every country of the world.

A
T
B
F
50

How does flooding rice fields reduce the need for herbicides and pesticides in rice farming?

A
While rice has a submerged growth state, most weeds and pests do not.
B
Flooding the fields causes the soil to degrade so weeds cannot take root.
C
Residual herbicides and pesticides from previous seasons dissolve in the water.
D
All of the above
51

How do microorganisms affect humus and thereby soil health?

A
The presence of any microorganisms causes the destruction of humus, which leads to a reduction in soil health.
B
Microorganisms increase the production of humus, which leads to a decrease in soil health.
C
Microorganisms increase the production of humus, which leads to an increase in soil health.
D
Microorganisms exist independently of humus and therefore do not affect soil health.
52

How does overtillage harm soil?

A
Overtillage can increase the rate of humus decomposition.
B
Overtillage can increase the water carrying capacity of soil.
C
Overtillage can result in increased soil compaction.
D
Overtillage can increase the organic material in soil.
53

Microorganisms play an important role in creating nutrient-rich soil.

A
T
B
F
54

Which of the following soil particle types is the largest?

A
sand
B
silt
C
clay
D
potassium
55

The high productivity of American agriculture is exemplified by _______.

A
low crop yields per farm worker
B
high crop yields per farm worker
C
the small cultivated area per inhabitant
D
the small cultivated area per farmer
56

Which of the following is not true concerning tropical plantations?

A
They are generally found in humid, tropical climates.
B
Wheat and corn are common products of tropical plantations.
C
Most crops from tropical plantations are exported.
D
Cocoa, coffee and tea are common products of tropical plantations.
57

Which of the following is the most damaging method of soil remediation?

A
soil excavation and disposal
B
soil aeration
C
heating and vapor extraction
D
microbial digestion
58

What characteristic is shared by both inceptisols and entisols, the soils of flood plains?

A
They both have well-developed soil horizons and profiles.
B
Both are young and only beginning to develop horizons and a soil profile.
C
They are both at the final stage of soil development.
D
None of the above
59

Why might soils rich in organic matter not be fertile?

A
Soil fertility comes from a balance of organic matter and other mineral nutrients.
B
Large amounts of organic material make soil retain too little water.
C
Soil fertility is a result of the inorganic minerals present.
D
Soils rich in organic material are always highly fertile.
60

Animals contribute to soil formation through decomposition of organic material.

A
T
B
F

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