AnswersIC Environmental Science - DeeringTopic Test

Topic Test Answers

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1
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How is over-irrigation damaging to soil?

A
It reduces the amount of organic material in soil.
B
It results in the accumulation of salt near the soil surface.
C
It increases the acidity of soil.
D
It removes water from the water table.
2
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Permafrost (gelisol) is considered a hearty, robust soil type.

A
T
B
F
3

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
4

Which of the following soil properties is not influenced by microorganism activity?

A
soil acidity
B
amount of organic matter
C
nutrient levels
D
none of the above
5

Which of the following methods of agriculture is the most reliant upon technology and automation?

A
rangeland grazing
B
American agriculture
C
traditional rice cultivation
D
Dutch agriculture
6

Which of the following statements about horizons is true?

A
They are characterized by whether they are solid, liquid, or gas.
B
They are represented by Roman numerals.
C
All soils have completely different horizon patterns.
D
They are defined by their different physical features.
7

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
8

Which of the following factors does not affect soil formation?

A
precipitation
B
time
C
erosion
D
none of the above
9

Soil fertility is best described as being dependent upon _______.

A
the balance between organic matter and mineral nutrients
B
soil color and the local climate
C
topography and the local climate
D
soil texture
10

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

A
T
B
F
11

Microorganisms and humus have little impact on soil health.

A
T
B
F
12

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
13

Soil color is classified by _______.

A
using a microscope
B
taking core samples
C
determining the proportion of minerals
D
using a color reference chart
14

The organisms native to an area will impact the types of soil found in that area.

A
T
B
F
15

Lower temperatures lead to slower soil formation.

A
T
B
F
16

Which of the following is not a defining characteristic of soil?

A
mineral composition
B
humidity
C
texture
D
color
17

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
18

Humus creates good soil tilth, which is an indirect benefit of microorganism action.

A
T
B
F
19

Soil is not directly important to animal life.

A
T
B
F
20

What is the purpose of strip cropping?

A
prevent soil erosion
B
maintain nutrient levels
C
reduce plant disease
D
all of the above

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