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1

True or false. Humans have altered approximately 10% of the land.
A)True
B)False
2

The approach of preserving populations of organisms while still using them is called _____________.
A)exploitation
B)farming
C)sustainability
D)environmentalism
3

Pressing environmental concerns include _______________.
A)photochemical smog
B)acid deposition
C)ozone depletion
D)All of these are correct.
4

Acid deposition is a result of _____________.
A)farming
B)burning high-sulfur coal
C)eutrophication
D)ozone thinning
6

The drop in pH of lakes in the northeastern U.S. is as low as ___________.
A)pH 10
B)pH 8
C)pH 7
D)pH 3 to pH 5
7

The effect of acid deposition on lakes includes ______________.
A)loss of biodiversity
B)death of fish eggs
C)alteration of food webs
D)All of these are correct.
8

How does stratospheric ozone contribute to life on Earth?
A)It absorbs ultraviolet radiation.
B)It prevents the absorption of cosmic radiation.
C)It absorbs infrared radiation.
D)It causes CO2 emissions in cities to increase.
9

What is the effect of carbon dioxide in the atmosphere?
A)it destroys ozone
B)it absorbs heat energy so it cannot be reflected and radiated into space
C)it reflects heat back to space
D)it forms ozone
10

Possible outcomes of global warming are _______________.
A)tropical diseases migrating northward
B)south becoming too dry to support crops
C)coastal flooding as polar ice melts
D)All of these are correct.
11

What is the main problem in destroying forest in the tropical rain forest of places like Brazil?
A)Entire food webs topple when the trees are removed.
B)The cost of remediation is enormous.
C)The forest will not return.
D)None of these is correct.
12

Desertification occurs as a result of ______________.
A)drought
B)overgrazing
C)improper irrigation
D)vehicle activity
E)All of these are correct.
13

True or false. Heat can be considered a pollutant in aquatic ecosystems.
A)True
B)False
14

What is the most long-lasting problem following an oil spill?
A)economic loss to the oil company
B)loss of biodiversity
C)expense of cleanup
D)reproductive failure in survivors
15

True or false. Human activity can accelerate the natural rate of lake eutrophication.
A)True
B)False
16

Which ecosystem has not been greatly affected by human pollution?
A)freshwater lakes
B)coral reefs
C)estuaries
D)None of these is correct.
17

True or false. Threats to coral reef ecosystems are human-induced only.
A)True
B)False
18

Which of these has contributed to an apparent increase in infectious diseases among ocean occupants?
A)human activities
B)El Nino
C)global warming
D)All of these are correct.
19

True or false. The hypothesis that underscores the necessity for wide-ranging biodiversity in ecosystems is the diversity-stability hypothesis.
A)True
B)False
20

What is a cause of diminishing biodiversity?
A)habitat destruction
B)disease
C)introduced species
D)increasing human population size
E)All of these are correct.





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