AnswersIC Sem B Environmental SystemsStreams and Rivers

Streams and Rivers — Unit test Answers

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21
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Which of the following is a way humans have impacted the rainforests, but not the tundra?

A
oil drilling
B
mining
C
overgrazing
D
logging
22
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Wetlands help reduce erosion through _______.

A
nutrient absorption
B
sediment trapping
C
bacterial absorption
D
all of the above
23

Which of the following is true concerning hull fouling from commercial shipping and recreational boating?

A
It constitutes less than half of all nonnative species introductions.
B
The revenue brought in from these industries is relatively small.
C
It is difficult to prevent since ship hulls begin, conduct, and end voyages in water.
D
It is best combated by chemical treatments.
24

Wetlands occurring in areas with a large amount of trees are most likely _______.

A
swamps
B
bogs
C
marshes
D
none of the above
25

Which of the following is a limiting factor in lotic ecosystems?

A
pH
B
salinity
C
light intensity
D
all of the above
26

Where is light penetration in a river or stream likely to be lowest?

A
the source
B
the mouth
C
the middle portion
D
none of the above
27

Which of the following is not used to classify biomes?

A
weather patterns
B
continent
C
dominant plant life
D
geographical terrain
28

Which of the following does not explain the importance of mangrove forests?

A
They provide shelter to organisms on high energy coasts.
B
They help prevent erosion along coasts.
C
They increase surface runoff and flooding.
D
They filter and process pollutants out of the environment.
29

Littoral zones are more likely to contain vegetation than riparian zones.

A
T
B
F
30

The main difference between stream pools and ponds is that stream pools _______.

A
have an observable current
B
are located inland
C
have no access to rivers or streams
D
are usually larger than ponds
31

The marine biome is the largest of all the ecosystems.

A
T
B
F
32

Why are coral reefs overexploited?

A
Coral is an important food resource.
B
Coral and its organisms are valuable commodities in the aquarium industry.
C
Coral reefs inhibit recreational activities.
D
All of the above
33

How has human use of salt marshes changed over time?

A
Humans have come to value salt marshes and now seek to preserve and restore them.
B
Humans now use drained salt marshes exclusively for agriculture.
C
Humans have begun to use salt marshes for landfills.
D
Humans have begun to use marsh land for housing and commercial development.

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