Question 1

Carbon dioxide levels are increasing because

Accepted Answer

A) human agriculture has greatly increased the amount of carbon dioxide given off by plants during respiration. 
B) humans have begun releasing carbon that was formerly sequestered in fossil fuels into the atmosphere. 
C) holes in the ozone layer have reduced the total amount of photosynthesis occurring in the biosphere. 
D) the huge growth in the human population and domestic livestock has increased the amount of carbon dioxide being released through respiration. 
A) human agriculture has greatly increased the amount of carbon dioxide given off by plants during respiration. 
B) humans have begun releasing carbon that was formerly sequestered in fossil fuels into the atmosphere. 
C) holes in the ozone layer have reduced the total amount of photosynthesis occurring in the biosphere. 
D) the huge growth in the human population and domestic livestock has increased the amount of carbon dioxide being released through respiration.

Question 2

Scientists predict that current increases in atmospheric carbon dioxide concentrations will cause temperatures on Earth to rise, a phenomenon known as ____________________.

Accepted Answer

The answer of Scientists predict that current increases in atmospheric...

Question 3

Which of the following would cause the slowest global change?

Accepted Answer

A) continental drift 
B) climate change 
C) human activity 
D) volcanic activity 
A) continental drift 
B) climate change 
C) human activity 
D) volcanic activity

Question 4

The best hope for slowing the recent rapid ecological changes is to decrease the impact of ____________________ on Earth to a sustainable level.

Accepted Answer

The answer of The best hope for slowing the recent...

Question 5

Which of the following choices is a major difference between human-caused global change and that which occurs naturally?

Accepted Answer

A) Human-caused global change occurs more quickly, leaving organisms less time to adapt. 
B) Human-caused global changes are of a smaller scale than naturally caused changes. 
C) Naturally caused global change occurs only at one place on Earth at a time. 
D) Naturally caused global changes are limited to the terrestrial habitats where humans live. 
A) Human-caused global change occurs more quickly, leaving organisms less time to adapt. 
B) Human-caused global changes are of a smaller scale than naturally caused changes. 
C) Naturally caused global change occurs only at one place on Earth at a time. 
D) Naturally caused global changes are limited to the terrestrial habitats where humans live.

Question 6

Carbon dioxide makes up approximately _____ percent of Earth's atmosphere.

Accepted Answer

A) 94 
B) 44 
C) 4 
D) 0.04 
A) 94 
B) 44 
C) 4 
D) 0.04

Question 7

The carbon that is increasing the levels of carbon dioxide in our atmosphere comes largely from fossil fuels.

Accepted Answer

A) True 
 B)False

Question 8

Human activities presently fix more nitrogen than all natural sources combined.

Accepted Answer

A) True 
 B)False

Question 9

Even without the melting of polar ice, sea levels are anticipated to rise because warm water expands.

Accepted Answer

A) True 
 B)False

Question 10

Humans use approximately 15 percent of the world's total net primary production.

Accepted Answer

A) True 
 B)False

Question 11

Using more "green" building materials, recycling more waste, using bicycles more, and reducing the use of fossil fuels are examples of ways that we can work toward ____________________.

Accepted Answer

The answer of Using more "green" building materials, recycling more...

Question 12

Which of the following does not represent evidence for global warming?

Accepted Answer

A) The 10 hottest years on record have occurred since 1990. 
B) In Europe, bird and butterfly species have shifted their ranges northward. 
C) The hole in the ozone layer over Antarctica has been growing in size. 
D) Plants in northern latitudes have increased the length of their growing seasons. 
A) The 10 hottest years on record have occurred since 1990. 
B) In Europe, bird and butterfly species have shifted their ranges northward. 
C) The hole in the ozone layer over Antarctica has been growing in size. 
D) Plants in northern latitudes have increased the length of their growing seasons.

Question 13

The figure below shows the relative concentration of polychlorinated biphenyls (PCBs)in several members of a lake food web.  
Although the lake trout and minnow are both fish, the lake trout is more contaminated. Why?

Accepted Answer

A) Lake trout are bigger so their bodies can store a greater quantity of PCBs. 
B) PCBs dissolve poorly in water but readily in fat; lake trout have a higher percentage of body fat than minnows. 
C) Lake trout are large and long-lived; when they respire they pass water over their gills allowing the PCBs in the lake to accumulate in their bodies. 
D) Lake trout fed on minnows, whereas minnows fed on crustaceans. 
A) Lake trout are bigger so their bodies can store a greater quantity of PCBs. 
B) PCBs dissolve poorly in water but readily in fat; lake trout have a higher percentage of body fat than minnows. 
C) Lake trout are large and long-lived; when they respire they pass water over their gills allowing the PCBs in the lake to accumulate in their bodies. 
D) Lake trout fed on minnows, whereas minnows fed on crustaceans.

Question 14

Ample evidence now exists that demonstrates that human activities are strongly associated with global warming.

Accepted Answer

A) True 
 B)False

Question 15

Humans are particularly adept at water transformation; current estimates are that human activities have affected nearly _____ percent of the world's rivers.

Accepted Answer

A) 10 
B) 40 
C) 70 
D) 100 
A) 10 
B) 40 
C) 70 
D) 100

Question 16

Which of the following is a source of naturally occurring carbon dioxide in the atmosphere?

Accepted Answer

A) cellular respiration by living organisms 
B) the combustion of plant material ignited by lightning 
C) volcanic eruptions 
D) all of the above 
A) cellular respiration by living organisms 
B) the combustion of plant material ignited by lightning 
C) volcanic eruptions 
D) all of the above

Question 17

Although not directly toxic to living organisms, chlorofluorocarbons (CFCs)have had unanticipated impacts on the atmosphere. The ecological impacts of CFCs will be

Accepted Answer

A) relatively benign because even as secondary pollutants their toxicity remains low. 
B) limited to the terrestrial ecosystem only. 
C) limited to high-altitude communities where ultraviolet radiation is more intense. 
D) uniformly serious, with effects experienced in almost all ecosystems and trophic levels. 
A) relatively benign because even as secondary pollutants their toxicity remains low. 
B) limited to the terrestrial ecosystem only. 
C) limited to high-altitude communities where ultraviolet radiation is more intense. 
D) uniformly serious, with effects experienced in almost all ecosystems and trophic levels.

Question 18

Long-lived synthetic organic molecules that bioaccumulate in organisms are referred to as ____________________.

Accepted Answer

persistant

Question 19

The industrial production of fertilizers by humans

Accepted Answer

A) removes carbon dioxide from the atmosphere. 
B) is causing a hole in the ozone layer. 
C) has greatly increased the extent of human participation in the nitrogen cycle. 
D) reduces the amount of acid rain. 
A) removes carbon dioxide from the atmosphere. 
B) is causing a hole in the ozone layer. 
C) has greatly increased the extent of human participation in the nitrogen cycle. 
D) reduces the amount of acid rain.

Question 20

Land and water transformations have many unintended consequences. One of the most serious is

Accepted Answer

A) the extinction of species. 
B) continental drift. 
C) the increasing concentrations of atmospheric ozone. 
D) the reduction in global atmospheric carbon dioxide levels and the subsequent decline in worldwide NPP. 
A) the extinction of species. 
B) continental drift. 
C) the increasing concentrations of atmospheric ozone. 
D) the reduction in global atmospheric carbon dioxide levels and the subsequent decline in worldwide NPP.

Exam 25: Global Change

Carbon dioxide levels are increasing because

Scientists predict that current increases in atmospheric carbon dioxide concentrations will cause temperatures on Earth to rise, a phenomenon known as ____________________.

Which of the following would cause the slowest global change?

The best hope for slowing the recent rapid ecological changes is to decrease the impact of ____________________ on Earth to a sustainable level.

Which of the following choices is a major difference between human-caused global change and that which occurs naturally?

Carbon dioxide makes up approximately _____ percent of Earth's atmosphere.

The carbon that is increasing the levels of carbon dioxide in our atmosphere comes largely from fossil fuels.

Human activities presently fix more nitrogen than all natural sources combined.

Even without the melting of polar ice, sea levels are anticipated to rise because warm water expands.

Humans use approximately 15 percent of the world's total net primary production.

Using more "green" building materials, recycling more waste, using bicycles more, and reducing the use of fossil fuels are examples of ways that we can work toward ____________________.

Which of the following does not represent evidence for global warming?

The figure below shows the relative concentration of polychlorinated biphenyls (PCBs)in several members of a lake food web. Although the lake trout and minnow are both fish, the lake trout is more contaminated. Why?

Ample evidence now exists that demonstrates that human activities are strongly associated with global warming.

Humans are particularly adept at water transformation; current estimates are that human activities have affected nearly _____ percent of the world's rivers.

Which of the following is a source of naturally occurring carbon dioxide in the atmosphere?

Although not directly toxic to living organisms, chlorofluorocarbons (CFCs)have had unanticipated impacts on the atmosphere. The ecological impacts of CFCs will be

Long-lived synthetic organic molecules that bioaccumulate in organisms are referred to as ____________________.

The industrial production of fertilizers by humans

Land and water transformations have many unintended consequences. One of the most serious is

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