Question 1

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." What is the best explanation for this conclusion?

Accepted Answer

A)  Carbon dioxide is toxic to plants.
B)  No plants can survive at high temperatures.
C)  Greenhouse gases will block the amount of light available for photosynthesis.
D)  Temperatures will change faster than plants can adapt.
E)  If animals go extinct the plants that depend on them will go extinct as well.

Question 2

Any chemical,physical,or biological change in the environment that harms living organisms is

Accepted Answer

A)  nitrification.
B)  an "upwelling."
C)  deforestation.
D)  ozone depletion.
E)  pollution.

Question 3

The greatest threat to the endangered great spotted kiwi of New Zealand is introduced predators.

Accepted Answer

A) True 
 B)False

Question 4

In addition to eutrophication in lakes,which process is caused by excess nutrients in rivers?

Accepted Answer

A)  warming of the water in the Gulf of Mexico
B)  introduction of exotic species like Zebra mussels
C)  the dead zone in the Gulf of Mexico
D)  decreased plant growth
E)  clogging of city water lines

Question 5

Of every 100 species introduced,only one persists to take over a niche.

Accepted Answer

A) True 
 B)False

Question 6

The normal pH of rainfall

Accepted Answer

A)  is slightly acidic,pH 5.6.
B)  is slightly basic,pH 9.6.
C)  is slightly acidic,pH 9.6.
D)  is neutral,pH 7.0.
E)  is slightly basic,pH 5.6.

Question 7

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.

Question 8

One key to reversing environmental decline is to slow the growth of the human population.

Accepted Answer

A) True 
 B)False

Question 9

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.

Question 10

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.

Question 11

In the section "Investigating Life:The Case of the Missing Frogs:Is Climate the Culprit?",the disappearance of harlequin frogs from Costa Rica's Monteverde Cloud Forest Preserve was related to oil spills and a bacterial skin infection.

Accepted Answer

A) True 
 B)False

Question 12

Since the 1950s,______ of the ocean's large predatory fishes have disappeared.

Accepted Answer

A)  20%
B)  50%
C)  90%
D)  70%
E)  1%

Question 13

Global warming is a human-caused increase in the greenhouse gases in Earth's atmosphere,thereby causing climate conditions more extreme than the greenhouse effect alone.

Accepted Answer

A) True 
 B)False

Question 14

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.

Question 15

Conservation biologists breed some endangered species like the panda bear in captivity.Which is the most likely reason that panda populations in the wild are still threatened?

Accepted Answer

A)  Not enough animals can be bred to release into the wild.
B)  Their environment is polluted.
C)  Loss of habitat has occurred.
D)  The wild pandas cannot breeD.
E)  Their population density is too high.

Question 16

A decrease in the ozone layer and a subsequent increase in the UV radiation reaching the Earth's surface is a significant factor in the increasing number of cases of human

Accepted Answer

A)  lung cancer.
B)  tuberculosis.
C)  stillbirths.
D)  skin cancer.
E)  malaria.

Question 17

One important conservation tool used to restore native populations is to set aside an area and protect it from overexploitation,invasive species,and habitat destruction.

Accepted Answer

A) True 
 B)False

Question 18

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.

Question 19

Canvasback ducks and bog turtles are likely impacted by purple loosestrife by

Accepted Answer

A)  loss of food.
B)  loss of diversity.
C)  overexploitation.
D)  pollution.
E)  climate changE.

Question 20

After nearing extinction in the 1960s,the bald eagle population is now about 10,000.

Accepted Answer

A) True 
 B)False

Exam 20: Preserving Biodiversity

Any chemical,physical,or biological change in the environment that harms living organisms is

Correct Answer
verified

The greatest threat to the endangered great spotted kiwi of New Zealand is introduced predators.

Correct Answer
verified

The normal pH of rainfall

Correct Answer
verified

After nearing extinction in the 1960s,the bald eagle population is now about 10,000.

Correct Answer
verified

A decrease in the ozone layer and a subsequent increase in the UV radiation reaching the Earth's surface is a significant factor in the increasing number of cases of human

Correct Answer
verified

In addition to eutrophication in lakes,which process is caused by excess nutrients in rivers?

Correct Answer
verified

Of every 100 species introduced,only one persists to take over a niche.

Correct Answer
verified

How are extinctions related to biodiversity?

Correct Answer
verified

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

Correct Answer
verified

Since the 1950s,______ of the ocean's large predatory fishes have disappeared.

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

In the section "Investigating Life:The Case of the Missing Frogs:Is Climate the Culprit?",the disappearance of harlequin frogs from Costa Rica's Monteverde Cloud Forest Preserve was related to oil spills and a bacterial skin infection.

Correct Answer
verified

Correct Answer
verified

Conservation biologists breed some endangered species like the panda bear in captivity.Which is the most likely reason that panda populations in the wild are still threatened?

Correct Answer
verified

Canvasback ducks and bog turtles are likely impacted by purple loosestrife by

Correct Answer
verified

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

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

One important conservation tool used to restore native populations is to set aside an area and protect it from overexploitation,invasive species,and habitat destruction.

Correct Answer
verified

One key to reversing environmental decline is to slow the growth of the human population.

Correct Answer
verified

Global warming is a human-caused increase in the greenhouse gases in Earth's atmosphere,thereby causing climate conditions more extreme than the greenhouse effect alone.

Correct Answer
verified

Exam 20: Preserving Biodiversity

Any chemical,physical,or biological change in the environment that harms living organisms is

Correct AnswerverifiedShow Answer

The greatest threat to the endangered great spotted kiwi of New Zealand is introduced predators.

Correct AnswerverifiedShow Answer

The normal pH of rainfall

Correct AnswerverifiedShow Answer

After nearing extinction in the 1960s,the bald eagle population is now about 10,000.

Correct AnswerverifiedShow Answer

A decrease in the ozone layer and a subsequent increase in the UV radiation reaching the Earth's surface is a significant factor in the increasing number of cases of human

Correct AnswerverifiedShow Answer

In addition to eutrophication in lakes,which process is caused by excess nutrients in rivers?

Correct AnswerverifiedShow Answer

Of every 100 species introduced,only one persists to take over a niche.

Correct AnswerverifiedShow Answer

How are extinctions related to biodiversity?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Since the 1950s,______ of the ocean's large predatory fishes have disappeared.

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

In the section "Investigating Life:The Case of the Missing Frogs:Is Climate the Culprit?",the disappearance of harlequin frogs from Costa Rica's Monteverde Cloud Forest Preserve was related to oil spills and a bacterial skin infection.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Conservation biologists breed some endangered species like the panda bear in captivity.Which is the most likely reason that panda populations in the wild are still threatened?

Correct AnswerverifiedShow Answer

Canvasback ducks and bog turtles are likely impacted by purple loosestrife by

Correct AnswerverifiedShow Answer

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

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

One important conservation tool used to restore native populations is to set aside an area and protect it from overexploitation,invasive species,and habitat destruction.

Correct AnswerverifiedShow Answer

One key to reversing environmental decline is to slow the growth of the human population.

Correct AnswerverifiedShow Answer

Global warming is a human-caused increase in the greenhouse gases in Earth's atmosphere,thereby causing climate conditions more extreme than the greenhouse effect alone.

Correct AnswerverifiedShow Answer

Correct Answer
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