AnswersSC332 Environmental Science BSoil and Agriculture

Soil and Agriculture — Unit test Answers

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1
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Rainforests are not exclusively found near the equator.

A
T
B
F
2
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Which of the following statements about human impact on trees is true?

A
Human activity always has a negative impact on trees.
B
All human uses of trees require destruction of the trees.
C
Human activity has had both a positive and negative impact on trees.
D
Cutting down trees is the only activity that has a negative impact on trees.
3

How do trees improve water quality?

A
Tree roots anchor soil in place, preventing runoff.
B
Water is filtered as it passes through the root systems of trees.
C
An adult tree can store nearly 250 gallons of water.
D
All of the above
4

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
5

Dutch agriculture is one of the most labor intensive types of agriculture in the world.

A
T
B
F
6

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.
7

Which of the following is not true concerning rainforests?

A
Twenty-five percent of western pharmaceuticals are derived from rainforest ingredients.
B
Almost 50,000 rainforest species are lost every year due to deforestation.
C
Half of all rainforest plants have been tested for their medicinal properties.
D
Projections say rainforest deforestation could eliminate half of the world’s species.
8

Which of the following forest management practices is the most harmful to forest ecosystems?

A
clearcutting
B
shelterwood cutting
C
group selection
D
single tree selection
9

The main characteristic of a carbon sink is that _______.

A
it emits no carbon
B
it absorbs no carbon
C
it emits more carbon than it absorbs
D
it absorbs more carbon than it emits
10

Salinization increases the concentration of _______ in soil.

A
plants
B
nutrients
C
salt
D
water
11

The promotion of companies’ sustainably harvested rainforest products is intended to _______.

A
produce cheaper products
B
promote overconsumption
C
give the company a competitive advantage
D
produce more expensive products
12

Which of the following statements about forestry education is true?

A
All educational facilities cover forestry to the same depth.
B
Individuals can pursue doctorates in forestry in any state.
C
Program focus will remain the same from state to state.
D
Some states have greater access to forestry programs than others.
13

Which of the following best describes the use of rainforest plants as anticancer drugs?

A
Most rainforest plants have been tested for their cancer fighting properties.
B
Twenty-five percent of the active ingredients in cancer drugs are exclusively rainforest plants.
C
The most powerful anticancer drugs are not rainforest plants.
D
All of the above
14

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.
15

What percent of the trees cut down are used for something other than paper?

A
35%
B
45%
C
55%
D
65%

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