Question 1

What percentage of known species are invertebrates?

Accepted Answer

A)  75%
B)  50%
C)  35%
D)  65%

Question 2

One of the reasons humans rely heavily on only a few food crops is because

Accepted Answer

A)  We have not explored the cultivation of thousands of edible wild species.
B)  There are few edible wild species.
C)  We have already focused on the best tasting species for domestication and cultivation.
D)  It would be difficult for small farmers to cultivate the fragile wild species.
E)  All of these factors contribute to a heavy reliance on only a few species.

Question 3

The largest contributing factor for the current high rate of animal extinctions is

Accepted Answer

A)  Uncontrolled sport hunting in the developed world
B)  Commercial harvesting of wildlife in Africa
C)  Drought conditions caused by the greenhouse effect
D)  Habitat destruction worldwide
E)  None of these by themselves cause high rates of animal extinctions, but together they combine to cause high rates

Question 4

It is clear that a heavy dose of pesticides or other toxic pollutants can kill species.However, chronic exposure to pollutants seems to cause recent high mortality in marine mammals by

Accepted Answer

A)  Decreasing the plants that are normally in their environment, such as kelp, that they use for shelter
B)  Killing off the prey species that they depend on for food
C)  Direct bioaccumulation of the chemicals, such as lead, in their tissues
D)  Causing weakened immune systems and increased vulnerability to infection
E)  Eventually killing them

Question 5

Habitat fragmentation usually leads to a(n)

Accepted Answer

A)  Decrease in biodiversity
B)  Reduction in the number of introduced species
C)  Increase in biodiversity due to the isolated populations
D)  More stable environment

Question 6

What makes an exotic species become and invasive species?

Accepted Answer

A)  When individuals stop being only ornamental but are used for other purposes also.
B)  When they become annoying to people.
C)  All exotic species are also invasive.
D)  When individuals begins to colonize new areas and out-compete native species.

Question 7

A species in imminent danger of extinction is classified by the U.S.Endangered Species Act as

Accepted Answer

A)  Vulnerable
B)  Threatened
C)  Valuable
D)  Endangered
E)  At risk

Question 8

The high rate of poaching of rhinoceros is due mostly to

Accepted Answer

A)  The belief in medicinal value of their horns for 'traditional' medicines
B)  Overharvesting for their meat and hide
C)  Introduction of exotic species that compete for their food
D)  Habitat destruction
E)  All of these have contributed equally to the decrease in the rhinoceros population

Question 9

Zoo animals in the U.S.today come mainly from the wild.

Accepted Answer

A) True 
 B)False

Question 10

Ecological diversity is a measure of the number of

Accepted Answer

A)  Different kinds of organisms within a community or ecosystem
B)  Different versions of the same gene in an ecological community
C)  Sizes, colors, and shapes of organisms within an ecological community
D)  Niches, trophic levels, and ecological processes of a biological community
E)  Different species in an ecosystem

Question 11

If you have an aquarium with saltwater fish, 75 percent of your fish probably came from

Accepted Answer

A)  Captive breeding programs in the United States
B)  Captive breeding programs in Indonesia or the Philippines
C)  Wild fish populations caught with cyanide or nets
D)  Aquaculture programs in South Pacific countries
E)  Hybrid crosses of native U.S.fish

Question 12

Which of the following would be a characteristic of an exotic plant species?

Accepted Answer

A)  Produces a few seeds after many years to reach maturity
B)  Is a specialist, for example, has a low range of tolerance for soil acidity
C)  Is an opportunist that is desired by humans for food or ornamental value
D)  Has many predators and diseases
E)  Is a secondary consumer (trophic levels)

Question 13

Which of the following is an example of a natural cause of extinction?

Accepted Answer

A)  Freshwater Great Lakes mussels that compete with the Zebra Mussel
B)  Genetic assimilation as in the case of the hybridization of gray wolves or black ducks with mallards
C)  The passenger pigeon that went extinct at the beginning of this century
D)  An insect species in the tropical forest that cannot escape predation by native bird species in the forest
E)  All of these are examples of a natural cause of extinction

Question 14

Which of the following drugs is NOT derived from a naturally occurring organism?

Accepted Answer

A)  Penicillin
B)  Aspirin
C)  Cortisone
D)  Morphine
E)  Tetracycline

Question 15

Invasive (exotic)  species tend to __________ the balance of ecosystems and ______ biodiversity.

Accepted Answer

A)  Increase; decrease
B)  Increase; enhance
C)  Maintain; enhance
D)  Upset; decrease
E)  Upset; increase

Question 16

The pharmaceutical industry has an interest in preventing species extinction because

Accepted Answer

A)  People are healthier in a healthy environment.
B)  Undiscovered species may provide lucrative new drugs.
C)  Most taxonomists are drug makers.
D)  It wants to increase diversity in North America.
E)  They see the benefits of eco-design.

Question 17

Which of the following statements is true?

Accepted Answer

A)  Humans may have been causing extinctions for thousands of years, but our impact has recently increased.
B)  Humans have never had significant impact on species extinctions until the past four decades.
C)  Humans only began causing extinctions in the past 150 years.
D)  Humans are responsible for many of the mass extinctions in the geologic record.

Question 18

The U.S.Endangered Species Act officially expired in

Accepted Answer

A)  1973
B)  1950
C)  1988
D)  1905
E)  1992

Question 19

Use the following scenario:
There are three ecological communities, each with differing species, but all of them have 100 individual plants and animals.
Community A has 21 species. Of the 110 individuals, there are 50 individuals of one species and 3 each of the other 20 species.
Community B has 11 species. Of the 110 individuals, there are 90 individuals of one species and 2 each of the other 10 species.
Community C has 11 species. Of the 110 individuals, there are 10 individuals of each species.

-In this scenario, which communities have the same species evenness?

Accepted Answer

A)  Community A and C
B)  Community B and A
C)  Community C and B
D)  All three communities have the same species evenness
E)  None of the communities has the same species evenness

Question 20

Extinction is the term used when all members of a species

Accepted Answer

A)  Disappear in a locality
B)  Die
C)  Live in zoos
D)  Are threatened with imminent habitat loss
E)  Are in danger of disappearing in a locality

Exam 11: Biodiversity

Which of the following would be a characteristic of an exotic plant species?

Correct Answer
verified

Extinction is the term used when all members of a species

Correct Answer
verified

One of the reasons humans rely heavily on only a few food crops is because

Correct Answer
verified

Correct Answer
verified

Ecological diversity is a measure of the number of

Correct Answer
verified

Which of the following is an example of a natural cause of extinction?

Correct Answer
verified

Invasive (exotic) species tend to ____ the balance of ecosystems and biodiversity.

Correct Answer
verified

Zoo animals in the U.S.today come mainly from the wild.

Correct Answer
verified

A species in imminent danger of extinction is classified by the U.S.Endangered Species Act as

Correct Answer
verified

The pharmaceutical industry has an interest in preventing species extinction because

Correct Answer
verified

What makes an exotic species become and invasive species?

Correct Answer
verified

Which of the following drugs is NOT derived from a naturally occurring organism?

Correct Answer
verified

The U.S.Endangered Species Act officially expired in

Correct Answer
verified

The high rate of poaching of rhinoceros is due mostly to

Correct Answer
verified

If you have an aquarium with saltwater fish, 75 percent of your fish probably came from

Correct Answer
verified

Habitat fragmentation usually leads to a(n)

Correct Answer
verified

What percentage of known species are invertebrates?

Correct Answer
verified

Which of the following statements is true?

Correct Answer
verified

The largest contributing factor for the current high rate of animal extinctions is

Correct Answer
verified

It is clear that a heavy dose of pesticides or other toxic pollutants can kill species.However, chronic exposure to pollutants seems to cause recent high mortality in marine mammals by

Correct Answer
verified

Exam 11: Biodiversity

Which of the following would be a characteristic of an exotic plant species?

Correct AnswerverifiedShow Answer

Extinction is the term used when all members of a species

Correct AnswerverifiedShow Answer

One of the reasons humans rely heavily on only a few food crops is because

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Ecological diversity is a measure of the number of

Correct AnswerverifiedShow Answer

Which of the following is an example of a natural cause of extinction?

Correct AnswerverifiedShow Answer

Invasive (exotic) species tend to __________ the balance of ecosystems and ______ biodiversity.

Correct AnswerverifiedShow Answer

Zoo animals in the U.S.today come mainly from the wild.

Correct AnswerverifiedShow Answer

A species in imminent danger of extinction is classified by the U.S.Endangered Species Act as

Correct AnswerverifiedShow Answer

The pharmaceutical industry has an interest in preventing species extinction because

Correct AnswerverifiedShow Answer

What makes an exotic species become and invasive species?

Correct AnswerverifiedShow Answer

Which of the following drugs is NOT derived from a naturally occurring organism?

Correct AnswerverifiedShow Answer

The U.S.Endangered Species Act officially expired in

Correct AnswerverifiedShow Answer

The high rate of poaching of rhinoceros is due mostly to

Correct AnswerverifiedShow Answer

If you have an aquarium with saltwater fish, 75 percent of your fish probably came from

Correct AnswerverifiedShow Answer

Habitat fragmentation usually leads to a(n)

Correct AnswerverifiedShow Answer

What percentage of known species are invertebrates?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

The largest contributing factor for the current high rate of animal extinctions is

Correct AnswerverifiedShow Answer

It is clear that a heavy dose of pesticides or other toxic pollutants can kill species.However, chronic exposure to pollutants seems to cause recent high mortality in marine mammals by

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Invasive (exotic) species tend to ____ the balance of ecosystems and biodiversity.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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