AnswersPBCSD_Grade_Forgiveness_2001340_Environmental_Science_S1_2020Cumulative Exam

Cumulative Exam — Cumulative exam Answers

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1
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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.
2
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Freshwater biomes have _______.

A
organisms adjusted to high salinity
B
more diversity than marine biomes
C
a salinity of less than 1%
D
the ability to maintain their temperature year round
3

How is the heat generated by the reactor core of a nuclear power plant used to provide power to buildings?

A
It is used directly to heat homes and offices.
B
It generates steam, which turns a turbine, powering a generator.
C
It generates steam, which is then condensed back to water. This process produces energy.
D
All of the above
4

Genetic factors are more important than environmental factors in determining an individual’s personal health risks.

A
T
B
F
5

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
6

Which of the following statements about biodiversity is not true?

A
Changes to biodiversity never occur naturally.
B
Changes to biodiversity can lead to a decrease in ecosystem stability.
C
Changes to biodiversity can positively and negatively affect on an ecosystem.
D
Changes to biodiversity can lead to an increase in ecosystem stability.
7

What characteristic is shared by both inceptisols and entisols, the soils of flood plains?

A
They both have well-developed soil horizons and profiles.
B
Both are young and only beginning to develop horizons and a soil profile.
C
They are both at the final stage of soil development.
D
None of the above
8

Buffer zones _______.

A
can help regulate the acidity of aquatic ecosystems
B
help increase erosion rates
C
are set up around natural resource areas
D
all of the above
9

Which of the following best explains why humans need constant supplies of fresh water?

A
Humans need a constant supply of water to provide them with essential vitamins.
B
Humans need a constant supply of water to maintain proper hygiene.
C
Constant supplies of freshwater are needed because body water is continually being lost.
D
Constant supplies of freshwater are not actually necessary for survival.
10

Continued deforestation will most likely lead to _______.

A
a decrease in the number of endangered species
B
an increase in the number of endangered species
C
an increase in the number of oil and chemical spills
D
a decrease in glacial melting
11

Nuclear power is an example of an alternative energy source that has greater negative environmental impacts than the burning of fossil fuels.

A
T
B
F
12

Which of the following is a way that climate affects soil formation?

A
increased precipitation
B
warmer temperatures
C
increased winds
D
all of the above
13

Agricultural practices can lead to water pollution.

A
T
B
F
14

Areas with more rainfall will have the same rate of soil formation as areas with less rainfall.

A
T
B
F
15

Which of the following statements about large scale mineral extraction is true?

A
The economic benefits of large scale mineral extraction outweigh the environmental costs.
B
Large scale mineral extraction is more destructive than in the past.
C
Large scale extraction is vital to the economy of mining towns.
D
Mineral extraction cannot be done in ways that do not completely destroy the environment.
16

Minerals are extracted from the Earth through various mining practices.

A
T
B
F
17

There are risks associated with drinking potable water.

A
T
B
F
18

Humus creates good soil tilth, which is an indirect benefit of microorganism action.

A
T
B
F
19

Soil formation is dependent on a number of factors.

A
T
B
F
20

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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