AnswersIC Sem B Environmental SystemsStreams and Rivers

Streams and Rivers — Unit test Answers

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1
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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
2
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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
3

Insects are most likely found in which aquatic zone?

A
pelagic
B
littoral
C
benthic
D
all of the above
4

Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?

A
Some species might become invasive and destructive if they escaped.
B
Some species may be dangerous to humans.
C
Nonnative plants and animals should only be used for commercial purposes.
D
There is no reason to restrict an individuals’ right to own plants or animals.
5

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
6

The principle difference between where salt marshes and mangrove forests grow is the salinity of the water.

A
T
B
F
7

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.
8

Legislation has been ineffective at preserving coral reefs.

A
T
B
F
9

The marine biome is the largest of all the ecosystems.

A
T
B
F
10

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
11

The negative impacts of nonnative species generally outweigh the positive impacts.

A
T
B
F
12

Streams have a detectable current, while rivers do not.

A
T
B
F
13

The abundance and variety of foods available in wetlands is a large contributor to their biodiversity.

A
T
B
F
14

Brackish water is common in freshwater wetlands.

A
T
B
F
15

Humans evolved in the Eocene period.

A
T
B
F
16

Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?

A
Some species might become invasive and destructive if they escaped.
B
Some species may be dangerous to humans.
C
Nonnative plants and animals should only be used for commercial purposes.
D
There is no reason to restrict an individuals’ right to own plants or animals.
17

Eutrophication disrupts the balance of ecosystems.

A
T
B
F
18

Which of the following typical adaptations of marine animals is not found in sea otters?

A
streamlined body
B
webbed hands and feet
C
body covered in thick fur
D
breathing apparatus on the top of the head
19

The abundance and variety of foods available in wetlands is a large contributor to their biodiversity.

A
T
B
F
20

Which of the following is not one of the three major structures of coral reefs?

A
planulae
B
fringing
C
barrier
D
atoll

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