The Importance of Trees — Unit test Answers

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41
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Which of the following forest management practices is best for reestablishing areas of forest?

A
shelterwood cutting
B
even-aged management
C
reforestation
D
uneven-aged management
42
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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
43

How does the destruction of forests contribute to levels of atmospheric carbon?

A
Levels of atmospheric carbon are unaffected by destruction of forests, because the carbon entering the carbon cycle from the dead trees balances out the loss of carbon absorption during photosynthesis.
B
When trees are destroyed, their stored carbon reenters the carbon cycle decreasing levels of atmospheric carbon.
C
Fewer trees leads to greater amounts of carbon dioxide being absorbed from the atmosphere.
D
Fewer trees leads to smaller amounts of carbon dioxide being absorbed from the atmosphere.
44

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
46

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.
48

Which of the following statements about the interactions between insects and trees is not true?

A
For some species of trees, insects are required for pollination.
B
Trees provide necessary shelter for a variety of insect species.
C
Insects have predatory relationships with trees, rather than mutually beneficial ones.
D
Insects can cause loss of tree productivity and even death.
49

Which of the following about carbon sinks is not true?

A
They emit more carbon than they take in.
B
They take in more carbon they emit.
C
They store carbon from the atmosphere.
D
They include oceans and forests.

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