Answers26.3611055 ECSD Environmental Science FICUnit Test

Cumulative Midterm Exam Answers

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21
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Decomposers such as fungi break down the nutrients in dead plant and animal matter for use by _______.

A
producers
B
primary consumers
C
secondary consumers
D
tertiary consumers
22
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Coral reefs are a vast community of individual organisms.

A
T
B
F
23

Which of the following organisms feed on the detritus found in wetlands?

A
aquatic insects
B
birds
C
reptiles
D
predatory fish
24

The ozone layer is located in the _______.

A
troposphere
B
stratosphere
C
mesosphere
D
thermosphere
25

Increases in entropy lead to _______.

A
limitless work output
B
irreversible changes
C
energy increases
D
all of the above
26

Which of the following is not a reason that cane toads became an invasive species in Australia?

A
They are poisonous to most animals.
B
They are voracious predators.
C
They have almost no natural predators.
D
They are not well adapted to the Australian climate.
27

Which of the following species is an R-selected species?

A
Giant tortoises
B
Mosquitoes
C
Elephants
D
Redwoods
28

Which of the following is not a characteristic of the source of rivers and streams?

A
high oxygen levels
B
freshwater fish
C
cooler temperatures
D
murky waters
29

The ozone layer is located in the _______.

A
troposphere
B
stratosphere
C
mesosphere
D
thermosphere
30

Which of the following is an example of a long-term change to ecosystems?

A
seasons
B
tide cycle
C
evolution
D
population growth
31

Yellowstone National Park has 124 wolves living in it. The park covers 3472 square miles. What is the population density of wolves living in Yellowstone?

Question illustration
A
28 wolves/mi
B
0.0357 wolves/mi
C
82 wolves/mi
D
43 wolves/mi
32

Climate change caused by natural disasters cannot have a negative impact on ecosystems.

A
T
B
F
33

Human impact on streams and rivers is minimal.

A
T
B
F
34

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
35

After the energy crisis of the 1970’s and the OPEC oil embargo, the US _______.

A
increased its dependency on foreign oil
B
began to wean itself off of foreign oil and the economic vulnerability it brings
C
changed over to all renewable energy sources
D
began building new nuclear power plants to replace fossil fuel use
36

The following is a chemical reaction for _______ with ozone.

Question illustration
A
chlorofluorocarbons
B
halons
C
UV radiation
D
none of the above
37

Fossil fuels are an important natural resource used by society. Which of the following best describes fossil fuels?

A
They are any liquid fuel derived from once-living matter.
B
They are organic fuels derived from ancient plants and animals.
C
They are fuels in which dinosaur fossils are commonly found.
D
They are naturally occurring inorganic fuels like coal and petroleum.
38

A species of plants that adapts to become more tolerant of toxic heavy metals produced as a result of human mining activities is an example of _______.

A
stabilizing selection
B
disruptive selection
C
directional selection
D
mutation
39

Why is phytoplankton located near the ocean’s surface?

A
It cannot live in areas of high salinity.
B
It can more easily evade predators on the oceans’s surface.
C
It needs access to oxygen only found at the ocean’s surface.
D
It needs sunlight to survive.
40

Global climate change will have no impact to life on the Earth.

A
T
B
F

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