AnswersIC Environmental Science - DeeringThe Importance of Trees

Soil and Agriculture Answers

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1
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Crop rotation is a method of soil conservation because _______.

A
the land produces more than one type of crop
B
it requires plowing and tilling that reduces soil compaction
C
it does not use the same parcel of land in sequential seasons
D
it avoids the depletion of soil nutrients
2
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Genetically modified foods can contain genes from different, unrelated organisms.

A
T
B
F
3

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
4

Which of the following best explains why soil conservation is important to human agriculture?

A
Erosion prevention prevents millions of dollars in damage from mudslides.
B
It is easier to prevent the degradation of old soil than it is to generate new soil.
C
If the soil salinity gets too high crops will not be able to grow in it.
D
Soil contamination is a hazard to human and animal health.
5

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
6

Pastoral farming is best described as _______.

A
a method of raising livestock and moving herds
B
an African method of agriculture
C
a method of cultivating crops on poor soils
D
a common method of desert farming
7

Contour farming is a method for plowing across the slope of steep hills.

A
T
B
F
8

Which of the following are some reasons for the variations in agricultural practices around the world?

A
topography
B
tradition
C
amount of rainfall
D
all of the above
9

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
10

What is the purpose of strip cropping?

A
prevent soil erosion
B
maintain nutrient levels
C
reduce plant disease
D
all of the above
11

The shrubs and trees in windbreaks protect soil from erosion by rain water.

A
T
B
F
12

Which of the following is not an agricultural technique?

A
irrigation
B
selective breeding
C
livestock herding
D
none of the above
13

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

A
T
B
F
14

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
15

Why is Dutch agriculture critically dependent upon technology?

A
It produces almost 50% of the world supply of cut flowers and indoor plants.
B
It relies almost exclusively on genetically engineered crops.
C
Dutch agriculture is characterized by plant production in greenhouses.
D
Dutch fruit and vegetable production contributes to the global food supply.
16

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.
17

The main target when controlling the acidity of soils is ______.

A
neutralizing the pH
B
adding base
C
replacing lost cation nutrients
D
eliminating humic acids

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