AnswersIC Sem B Environmental SystemsChanging Waterways

Water Pollution Answers

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Why has the spread of the herbicide-resistant hydrilla through Florida’s waterways resulted in them no longer being navigable by most boats?

A
Thy hydrilla has induced a drought that drained the waterways.
B
The weed clogs propellers that boats use for propulsion.
C
The sticky leaves of the weed hold boats in place.
D
All of the above
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Which of the following is an example of mechanical control of nonnative species?

A
pesticides
B
herbicides
C
net barriers
D
inspections
3

Which of the following is not true concerning the zebra mussel in the United States?

A
It was introduced accidentally.
B
It was first introduced in the Great Lakes.
C
It is still spreading throughout the United States.
D
It can be eliminated from a river with minimal effort.
4

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.
5

Nonnative species are only introduced unintentionally.

A
T
B
F
6

Invasive species often unbalance the ecosystems into which they are introduced because _______.

A
they did not co-evolve with the natural species and lack natural controls, like predators
B
they breed quickly and have the potential to overpopulate an area
C
they consume local resources
D
none of the above
7

Introducing invasive species to an ecosystem results in an increase in biodiversity.

A
T
B
F
8

The rusty crayfish is harmful to native species of crayfish because it clear cuts the bottom of waterways leaving native species without a food supply.

A
T
B
F
9

Which of the following is not true about nonnative species?

A
They can have positive impacts on an ecosystem.
B
They can have negative impacts on an ecosystem.
C
They can be introduced within their natural range.
D
A nonnative species can be an invasive species.
10

Ships that use ballast water are not in danger of introducing invasive species into aquatic habitats.

A
T
B
F

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