Question 1

In addition to filling lakes with sediment,why is eutrophication a biological concern?

Accepted Answer

A)  Filling lakes is the only major concern.
B)  Excess algal growth leads to high levels of dissolved oxygen.
C)  Excess algal growth makes it difficult for primary consumers to find food.
D)  High levels of nutrients are toxic to algae.
E)  When the algae die and decompose,dissolved oxygen levels drop.F) A) and E)
G) A) and D)

Question 2

The current extinction rate of vertebrates is 100-1000 times the historical background.This is primarily due to

Accepted Answer

A)  overharvesting.
B)  competition with exotic species.
C)  habitat destruction.
D)  competition with native species.
E)  random chancE.F) B) and E)
G) A) and B)

Question 3

Each year almost _____ metric tons of carbon dioxide are released into Earth's atmosphere.

Accepted Answer

A)  500,000
B)  6,000,000
C)  1,000,000
D)  3,000,000
E)  4,000,000F) A) and B)
G) B) and E)

Question 4

A species that humans bring to an area where it did not previously occur is a(an)

Accepted Answer

A)  exotic species.
B)  native species.
C)  endemic species.
D)  existing species.
E)  endangered species.F) A) and B)
G) A) and E)

Question 5

In the section "Investigating Life: The Case of the Missing Frogs: Is Climate the Culprit?",how did climate change affect frog mortality?

Accepted Answer

A)  The chytrid fungus had optimal growth temperatures with cooler days and warmer nights.
B)  The frogs could not survive the cooler temperatures during the day.
C)  The frogs could not survive the warmer temperatures at night.
D)  The chytrid fungus had optimal growth temperatures with warmer days and cooler nights.
E)  The frogs' immune systems were suppressed by pollutants,making them more susceptible to infection by chytrid.F) C) and D)
G) A) and E)

Question 6

What resulted in the biodiversity on Earth?

Accepted Answer

A)  evolution
B)  global climate change
C)  the greenhouse effect
D)  overexploitation
E)  bycatchF) A) and E)
G) C) and D)

Question 7

The zebra mussel and the gypsy moth are native species of North America.

Accepted Answer

A) True 
 B)False  False

Question 8

Why are some conservation biologists concerned that the polar bear will be extinct by 2050?

Accepted Answer

A)  Over-hunting will decrease the population.
B)  Polar bears are in competition with brown bears.
C)  Increased snow will fall in the Arctic and the bears won't be able to hunt.
D)  The seal population will decrease,and the bears will starve.
E)  Arctic ice caps will melt and the bears won't be able to hunt.F) A) and B)
G) A) and D)

Question 9

Since the 1950s,only 1% of the ocean's large predatory fish have disappeared.

Accepted Answer

A) True 
 B)False  False

Question 10

An increase in the surface temperature of the Earth caused by heat-trapping gases in the atmosphere is known as

Accepted Answer

A)  the greenhouse effect.
B)  the biome effect.
C)  bioremediation.
D)  desertification.
E)  the nursery effect.F) A) and B)
G) C) and D)

Question 11

Which of the following best describes the greenhouse effect?

Accepted Answer

A)  Less light is radiated from the atmosphere.
B)  More light enters the atmosphere.
C)  More heat enters the atmosphere.
D)  Less heat is radiated from the atmosphere.
E)  The Earth produces more heat.F) None of the above
G) C) and D)

Question 12

The ______ in the stratosphere above Earth's surface absorbs much of the harmful UV wavelengths of light.

Accepted Answer

A)  benthic zone
B)  ozone layer
C)  cumulus clouds
D)  particulate layer
E)  profundal zoneF) A) and E)
G) B) and D)

Question 13

A type of air pollution that forms a visible haze in the lower atmosphere is

Accepted Answer

A)  fog.
B)  particulation.
C)  smog.
D)  acid rain.
E)  smokE.F) A) and D)
G) C) and D)

Question 14

Conservation biologists in the United States are protecting habitat of endangered species at the northern end of their current ranges.What is the rationale for this strategy?

Accepted Answer

A)  As global temperatures warm,biomes will move to the north.
B)  Animals tend to migrate to the north.
C)  Tectonic plates are shifting to the south.
D)  There are fewer people in the north,so there is more habitat available.
E)  Biodiversity is higher the farther north you go from the equator.F) D) and E)
G) A) and B)

Question 15

A 2004 study in the journal Nature concluded: "Many plant and animal species are unlikely to survive climate change.New analyses suggest that 15-37% of a sample of 1,103 land plants and animals would eventually become extinct as a result of climate changes expected by 2050.For some of these species there will no longer be anywhere suitable to live." How would the extinction of plant species lead to the extinction of animal species?

Accepted Answer

A)  Animals need plants for pollination.
B)  Plants consume carbon dioxide.
C)  Plants perform transpiration.
D)  Plants are the energy base of an ecosystem.
E)  Plants prevent soil erosion.F) A) and D)
G) A) and C)

Question 16

How are extinctions related to biodiversity?

Accepted Answer

A)  The more extinctions,the lower the species biodiversity.
B)  The more extinctions,the lower the habitat biodiversity.
C)  The more extinctions,the higher the genetic biodiversity.
D)  The more extinctions,the higher the species biodiversity.
E)  The more extinctions,the higher the habitat diversity.F) A) and B)
G) C) and D)

Question 17

In the section "Investigating Life: The Case of the Missing Frogs: Is Climate the Culprit?",at what elevations were most frog extinctions occurring according to Part A of the figure?

Accepted Answer

A)  0-199 m
B)  200-1000 m
C)  2,400-4,000 m
D)  1,001-2,399 m
E)  They were equally distributed at all elevations.F) A) and B)
G) A) and C)

Question 18

What areas are most susceptible to loss of biodiversity?

Accepted Answer

A)  open ocean
B)  locations near human activities
C)  rain forests
D)  temperate forests
E)  polar regionsF) A) and B)
G) All of the above B

Question 19

In a process called ______,nitrogen and phosphorus excessively fertilize algae in the water,resulting in algal blooms.

Accepted Answer

A)  particulation
B)  eutrophication
C)  denitrification
D)  nitrification
E)  desertificationF) A) and D)
G) B) and E)

Question 20

Commercial fisheries are increasing the harvest of smaller fish like anchovies because of ______ large predatory fishes.

Accepted Answer

A)  exotic
B)  competition with
C)  increases in
D)  pollution in
E)  overexploitation ofF) B) and E)
G) A) and D)

Exam 20: Preserving Biodiversity

In addition to filling lakes with sediment,why is eutrophication a biological concern?

Correct Answer
verified

The current extinction rate of vertebrates is 100-1000 times the historical background.This is primarily due to

Correct Answer
verified

Each year almost _____ metric tons of carbon dioxide are released into Earth's atmosphere.

Correct Answer
verified

A species that humans bring to an area where it did not previously occur is a(an)

Correct Answer
verified

In the section "Investigating Life: The Case of the Missing Frogs: Is Climate the Culprit?",how did climate change affect frog mortality?

Correct Answer
verified

What resulted in the biodiversity on Earth?

Correct Answer
verified

The zebra mussel and the gypsy moth are native species of North America.

Correct Answer
verified
False

Why are some conservation biologists concerned that the polar bear will be extinct by 2050?

Correct Answer
verified

Since the 1950s,only 1% of the ocean's large predatory fish have disappeared.

Correct Answer
verified
False

An increase in the surface temperature of the Earth caused by heat-trapping gases in the atmosphere is known as

Correct Answer
verified

Which of the following best describes the greenhouse effect?

Correct Answer
verified

The ______ in the stratosphere above Earth's surface absorbs much of the harmful UV wavelengths of light.

Correct Answer
verified

A type of air pollution that forms a visible haze in the lower atmosphere is

Correct Answer
verified

Conservation biologists in the United States are protecting habitat of endangered species at the northern end of their current ranges.What is the rationale for this strategy?

Correct Answer
verified

Correct Answer
verified

How are extinctions related to biodiversity?

Correct Answer
verified

In the section "Investigating Life: The Case of the Missing Frogs: Is Climate the Culprit?",at what elevations were most frog extinctions occurring according to Part A of the figure?

Correct Answer
verified

What areas are most susceptible to loss of biodiversity?

Correct Answer
verified
B

In a process called ______,nitrogen and phosphorus excessively fertilize algae in the water,resulting in algal blooms.

Correct Answer
verified

Commercial fisheries are increasing the harvest of smaller fish like anchovies because of ______ large predatory fishes.

Correct Answer
verified

Exam 20: Preserving Biodiversity

In addition to filling lakes with sediment,why is eutrophication a biological concern?

Correct AnswerverifiedShow Answer

The current extinction rate of vertebrates is 100-1000 times the historical background.This is primarily due to

Correct AnswerverifiedShow Answer

Each year almost _____ metric tons of carbon dioxide are released into Earth's atmosphere.

Correct AnswerverifiedShow Answer

A species that humans bring to an area where it did not previously occur is a(an)

Correct AnswerverifiedShow Answer

In the section "Investigating Life: The Case of the Missing Frogs: Is Climate the Culprit?",how did climate change affect frog mortality?

Correct AnswerverifiedShow Answer

What resulted in the biodiversity on Earth?

Correct AnswerverifiedShow Answer

The zebra mussel and the gypsy moth are native species of North America.

Correct AnswerverifiedFalse

Why are some conservation biologists concerned that the polar bear will be extinct by 2050?

Correct AnswerverifiedShow Answer

Since the 1950s,only 1% of the ocean's large predatory fish have disappeared.

Correct AnswerverifiedFalse

An increase in the surface temperature of the Earth caused by heat-trapping gases in the atmosphere is known as

Correct AnswerverifiedShow Answer

Which of the following best describes the greenhouse effect?

Correct AnswerverifiedShow Answer

The ______ in the stratosphere above Earth's surface absorbs much of the harmful UV wavelengths of light.

Correct AnswerverifiedShow Answer

A type of air pollution that forms a visible haze in the lower atmosphere is

Correct AnswerverifiedShow Answer

Conservation biologists in the United States are protecting habitat of endangered species at the northern end of their current ranges.What is the rationale for this strategy?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How are extinctions related to biodiversity?

Correct AnswerverifiedShow Answer

In the section "Investigating Life: The Case of the Missing Frogs: Is Climate the Culprit?",at what elevations were most frog extinctions occurring according to Part A of the figure?

Correct AnswerverifiedShow Answer

What areas are most susceptible to loss of biodiversity?

Correct AnswerverifiedB

In a process called ______,nitrogen and phosphorus excessively fertilize algae in the water,resulting in algal blooms.

Correct AnswerverifiedShow Answer

Commercial fisheries are increasing the harvest of smaller fish like anchovies because of ______ large predatory fishes.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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False

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False

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Correct Answer
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B

Correct Answer
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Correct Answer
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