AnswersWhites Environmental Science March 2 - 20_Section2Unit Test

Cumulative Final Exam Answers

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61
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What organism is the main producer in freshwater ecosystems?

A
phytoplankton
B
zooplankton
C
anaerobic bacteria
D
none of the above
62
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Soil generation and soil conservation are equally effective agricultural strategies.

A
T
B
F
63

Hedgerows have created a new ecosystem within Britain’s _______.

A
farms
B
cities
C
forests
D
industrial areas
64

Land clearing and irrigation in Australia have only resulted in an increase in the amount of land available for use as farmland.

A
T
B
F
65

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

A
T
B
F
66

Changes to waterways will discontinue if human impacts on waterways cease.

A
T
B
F
67

Which of the following is true concerning sources of water pollution?

A
Mine wastes and heavy metals become water pollution through storm water runoff.
B
Biodegradable materials like food, wood, and leaves are not considered pollution.
C
Petroleum byproducts and fuels end up as pollution principally from oil spills.
D
Pesticides and herbicides do not commonly become water pollutants.
68

Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?

A
Pollution began reflecting sunlight and heat rather than absorbing it.
B
Evidence of global warming became overwhelming.
C
Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.
D
Congress required scientists to assign a cause to global climate change.
69

The trend of declining ecosystem resource availability and increasing demand for these resources can best be countered by _______.

A
increasing the supply of ecosystem resources
B
decreasing the demand for ecosystem resources
C
applying sustainable development practices
D
developing new technologies for resource collection
70

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

A
T
B
F
71

Which of the following statements about air pollution is not true?

A
Air pollution is caused by natural and human processes.
B
Carbon monoxide and sulfur oxides are common air pollutants.
C
Natural components of air, like carbon dioxide, cannot be considered air pollutants.
D
Primary and secondary pollutants are harmful to human health and the environment.
72

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

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