Question 1

Some people believe it is unethical to collect wild animals and plants for display and personal pleasure and that such plants and animals should be left in the wild.Explain why you agree or disagree with this view.

Accepted Answer

The answer of Some people believe it is unethical to...

Question 2

Biodiversity experts estimate that during this century,the extinction rate due to human activities will rise to ____ times the background extinction rate.

Accepted Answer

A)  3 
B)  10 
C)  20 
D)  100 
E)  10,000

Question 3

The passenger pigeon,perhaps the must abundant bird on earth in 1813,was extinct less than one hundred years later because of human activities.

Accepted Answer

A) True 
 B)False

Question 4

The species-area relationship suggests that,on average,a 90% loss of habitat causes the extinction of ____________________% of the species living in that habitat.

Accepted Answer

The answer of The species-area relationship suggests that,on average,a 90%...

Question 5

Population declines among birds,especially long-distance migrant birds,have several primary causes.Which of the following is not one of these?

Accepted Answer

A)  habitat loss and fragmentation 
B)  introduction of nonnative species 
C)  collisions with power lines,towers,and skyscrapers 
D)  intentional poisoning of food supplies 
E)  climate change

Question 6

When a large,contiguous area of habitat is reduced in area and divided into smaller,more scattered patches,the process is called ____.

Accepted Answer

A)  habitat elimination 
B)  habitat exploitation 
C)  resource partitioning 
D)  habitat fragmentation 
E)  resource loss

Question 7

Efforts to control the Argentinean fire ant in the U.S.during the 1960s by spraying pesticides resulted in genetic resistance to pesticides in the fire ants.

Accepted Answer

A) True 
 B)False

Question 8

Biodiversity hotspots are ____.

Accepted Answer

A)  tropical areas where extinction is occurring 
B)  islands where extinction is occurring 
C)  areas with a variety of threatened or endangered species 
D)  large areas with a variety of thriving species 
E)  ecosystems that are acting to slow climate change

Question 9

Four of the following have resulted in an increase in hunting bushmeat;one has not.Which one is not a cause of this increase?

Accepted Answer

A)  rapidly growing human population 
B)  trying to make a living supplying restaurants with exotic meat 
C)  spread of AIDS 
D)  overfishing of ocean fish 
E)  accessibility to remote areas

Question 10

A(n)____________________ species has so few individual survivors that the species could soon become extinct over all or most of its natural range.

Accepted Answer

The answer of A(n)____________________ species has so few individual survivors...

Question 11

A 2006 study estimated the total polar bear population is likely to decline by how much by 2025?

Accepted Answer

A)  10-15% 
B)  20-25% 
C)  30-35% 
D)  40-45% 
E)  50+ %

Question 12

An endangered species ____.

Accepted Answer

A)  may soon become extinct over all or most of its range 
B)  is one that is evolving into another species 
C)  is one that may become rare in the next 100 years 
D)  may eventually become threatened or rare 
E)  may be considered economically important but rare

Question 13

Biologists think there are four major reasons why we should work to prevent human activities from causing the extinction of other species.Which of the following is not one of these reasons?

Accepted Answer

A)  Species are part of the earth's life support system. 
B)  Most species contribute to services that support our economies. 
C)  It will take from 5 million to 10 million years to rebuild the biodiversity. 
D)  We need animals,especially rare animals,for zoos. 
E)  Each species has a right to exist even if it isn't useful to us.

Question 14

It is easier to remove an invasive species than it is to control its introduction.

Accepted Answer

A) True 
 B)False

Question 15

What percentage of the world's known plant species have been examined for medicinal properties?

Accepted Answer

A)  0.5% 
B)  5% 
C)  10% 
D)  25% 
E)  33%

Question 16

When the loss or major decline of a keystone species leads to population declines and extinctions of other species with strong connections to the keystone species,ecologists say the process is called a _______________.

Accepted Answer

The answer of When the loss or major decline of...

Question 17

Captive breeding programs in zoos ____.

Accepted Answer

A)  eliminate the need to preserve critical habitats 
B)  can be used for most species except mammals 
C)  require the captive population to number between 100 and 500 
D)  increase the genetic variability of species 
E)  are very unsuccessful

Question 18

____________________ is the "extinction capital" of the United States.

Accepted Answer

The answer of ____________________ is the "extinction capital" of the...

Question 19

What percentage of the world's 10,000 bird species is declining in number?

Accepted Answer

A)  95% 
B)  70% 
C)  50% 
D)  33% 
E)  25%

Question 20

DDT use in the 1950s and 1960s was nearly responsible for the extinction of what familiar bird species?

Accepted Answer

A)  red-tailed hawk 
B)  common pigeon 
C)  chicken 
D)  bald eagle 
E)  cardinal

Exam 9: Sustaining Biodiversity: The Species Approach

Some people believe it is unethical to collect wild animals and plants for display and personal pleasure and that such plants and animals should be left in the wild.Explain why you agree or disagree with this view.

Biodiversity experts estimate that during this century,the extinction rate due to human activities will rise to ____ times the background extinction rate.

The passenger pigeon,perhaps the must abundant bird on earth in 1813,was extinct less than one hundred years later because of human activities.

The species-area relationship suggests that,on average,a 90% loss of habitat causes the extinction of ____________________% of the species living in that habitat.

Population declines among birds,especially long-distance migrant birds,have several primary causes.Which of the following is not one of these?

When a large,contiguous area of habitat is reduced in area and divided into smaller,more scattered patches,the process is called ____.

Efforts to control the Argentinean fire ant in the U.S.during the 1960s by spraying pesticides resulted in genetic resistance to pesticides in the fire ants.

Biodiversity hotspots are ____.

Four of the following have resulted in an increase in hunting bushmeat;one has not.Which one is not a cause of this increase?

A(n)____________________ species has so few individual survivors that the species could soon become extinct over all or most of its natural range.

A 2006 study estimated the total polar bear population is likely to decline by how much by 2025?

An endangered species ____.

Biologists think there are four major reasons why we should work to prevent human activities from causing the extinction of other species.Which of the following is not one of these reasons?

It is easier to remove an invasive species than it is to control its introduction.

What percentage of the world's known plant species have been examined for medicinal properties?

When the loss or major decline of a keystone species leads to population declines and extinctions of other species with strong connections to the keystone species,ecologists say the process is called a _______________.

Captive breeding programs in zoos ____.

____________________ is the "extinction capital" of the United States.

What percentage of the world's 10,000 bird species is declining in number?

DDT use in the 1950s and 1960s was nearly responsible for the extinction of what familiar bird species?