Week 13: Nonnative Species In Aquatic Ecosystems Answers

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1
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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
2
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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.
3

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

A
T
B
F
4

All nonnative species in an ecosystem are considered invasive species.

A
T
B
F
5

Why are cane toads in Australia considered an invasive species rather than simply nonnative?

A
They are destructive to native species and have no natural predators.
B
They reproduce more quickly than native species.
C
They have venom glands.
D
Large adult specimens are able to hunt snakes.
6

Hull fouling is a(n) _______ introduction of nonnative species.

A
unintentional
B
intentional
C
unimportant
D
land-based
7

Which of the following is an example of mechanical control of nonnative species?

A
pesticides
B
herbicides
C
net barriers
D
inspections
8

All of the following are true of the Zebra mussels found in the Great Lakes EXCEPT:

A
Zebra mussels are having are having a negative impact on the native population of mussels in the region.
B
They were unintentionally introduced to the Great Lakes by humans.
C
Zebra mussels have caused a great deal of environmental damage to the area.
D
People of the Great Lake region are benefitting from the economic advantages of having zebra mussels in the region.
9

Why does the aquarium trade contribute to the introduction of nonnative species?

A
Exotic species can escape or be released into local ecosystems.
B
Aquarium owners do not always understand how ecosystems interact.
C
Nonnative fish are shipped worldwide for aquariums.
D
All of the above
10

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

A
T
B
F

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