Question 1

On average,what percentage of the energy in one trophic level becomes incorporated into the next higher trophic level?

Accepted Answer

A)   10%
B)   30%
C)   50%
D)   90%E) A) and C)
F) C) and D)

Question 2

Herbivory is an example of a _____ interaction.

Accepted Answer

A)   +/+
B)   -/-
C)   0/+
D)   +/-E) A) and D)
F) B) and C)

Question 3

Which of these convert organic matter to inorganic matter by breaking down dead organisms?

Accepted Answer

A)   producers
B)   detritivores
C)   decomposers
D)   primary consumersE) B) and C)
F) A) and B)

Question 4

Biomass is the total amount of ______ an ecosystem.

Accepted Answer

A)   organic matter tied up in the consumers of
B)   organic matter tied up in the producers of
C)   chemical elements recycled by the detritivores of
D)   living organic material inE) None of the above
F) A) and B)

Question 5

Use the following information to answer the following question(s) .
Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic organisms are transmitted from one person to another by the female Anopheles mosquito when it feeds on human blood. Within humans, the Plasmodium spp. destroy red blood cells and, without effective treatment, serious infections can lead to death. Currently, more than 400 million people are afflicted with malaria and between 1 to 3 million people die from it each year. Historically, a chemical compound called quinine has been used in developing effective drugs against malaria. In its natural environment, quinine is produced by certain trees native to South America. This chemical is synthesized in the outer layer of tree trunks and acts as an herbivore deterrent.
-Based on the relationship between Plasmodium spp.and humans,these organisms would be considered ______.

Accepted Answer

A)   parasites
B)   hosts
C)   producers
D)   carnivoresE) B) and C)
F) None of the above

Question 6

The present rate of species loss ______.

Accepted Answer

A)   suggests that about 25% of all plant and animal species may be extinct by the end of the century
B)   is about the same as it has been during the last 100,000 years
C)   is as much as 100 times higher than at any time in the last 100,000 years
D)   is slower than in recent years because of conservation effortsE) A) and B)
F) All of the above

Question 7

The major abiotic reservoir for phosphorus is ______.

Accepted Answer

A)   the oceans
B)   the atmosphere
C)   rock
D)   dead organic matterE) All of the above
F) C) and D)

Question 8

The primary goal of conservation biology is to ______.

Accepted Answer

A)   catalog species
B)   maximize the land set aside for wildlife
C)   integrate human culture back into nature
D)   counter the loss of biodiversityE) All of the above
F) B) and D)

Question 9

Use the following information to answer the following question(s) .
Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic organisms are transmitted from one person to another by the female Anopheles mosquito when it feeds on human blood. Within humans, the Plasmodium spp. destroy red blood cells and, without effective treatment, serious infections can lead to death. Currently, more than 400 million people are afflicted with malaria and between 1 to 3 million people die from it each year. Historically, a chemical compound called quinine has been used in developing effective drugs against malaria. In its natural environment, quinine is produced by certain trees native to South America. This chemical is synthesized in the outer layer of tree trunks and acts as an herbivore deterrent.
-Humans,mosquitoes,and Plasmodium together would be considered a(n) ______.

Accepted Answer

A)   population
B)   community
C)   ecosystem
D)   population and communityE) A) and B)
F) A) and C)

Question 10

As a result of a severe disturbance,a community will ______.

Accepted Answer

A)   not be repopulated
B)   be replaced by a community that is completely different from the previous community
C)   not recover for thousands of years
D)   undergo successionE) A) and D)
F) B) and C)

Question 11

Why are most food chains limited to three to five trophic levels?

Accepted Answer

A)   The higher the trophic level, the larger the organism; the larger the organism, the less likely it will be prey.
B)   The nutritional quality of existing biomass decreases with increasing trophic level.
C)   Most ecosystems have insufficient space to support the increased number of organisms that more trophic levels would require.
D)   There is insufficient energy to support more trophic levels.E) B) and C)
F) A) and B)

Question 12

Use the following information to answer the following question(s) .
Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic organisms are transmitted from one person to another by the female Anopheles mosquito when it feeds on human blood. Within humans, the Plasmodium spp. destroy red blood cells and, without effective treatment, serious infections can lead to death. Currently, more than 400 million people are afflicted with malaria and between 1 to 3 million people die from it each year. Historically, a chemical compound called quinine has been used in developing effective drugs against malaria. In its natural environment, quinine is produced by certain trees native to South America. This chemical is synthesized in the outer layer of tree trunks and acts as an herbivore deterrent.
-Despite being used for many years,quinine-based drugs have not led to the eradication of malaria and currently there are mosquitoes that are resistant to the compound. Which of the following were likely important in the development of this resistance to quinine?

Accepted Answer

A)   natural selection
B)   mutualism
C)   interspecific competition
D)   biological magnificationE) B) and C)
F) None of the above

Question 13

Sustainable development ______.

Accepted Answer

A)   will require making difficult decisions regarding the environment and lifestyle
B)   must be achieved if the human species is to survive
C)   will require global, multinational cooperation
D)   involves all of the aboveE) None of the above
F) C) and D)

Question 14

What is one way in which energy flow differs from chemical cycling?

Accepted Answer

A)   Energy flow is unidirectional; chemical elements can be recycled.
B)   Energy can enter but cannot leave an ecosystem; chemical elements can leave but cannot enter an ecosystem.
C)   Energy flows from lower to higher trophic levels; chemicals cycle from higher to lower trophic levels.
D)   Energy can both enter and leave an ecosystem; chemical elements always remain within a single ecosystem.E) A) and D)
F) A) and C)

Question 15

Besides the atmosphere,abiotic reservoirs of carbon dioxide include

Accepted Answer

A)   fossil fuels and dissolved carbon compounds in the oceans.
B)   rocks and dissolved carbon compounds in the oceans.
C)   fossil fuels only.
D)   rocks only.E) C) and D)
F) B) and C)

Question 16

Most decomposers are _____.

Accepted Answer

A)   plants and fungi
B)   bacteria and plants
C)   fungi and prokaryotes
D)   animalsE) C) and D)
F) A) and B)

Question 17

A movement corridor ______.

Accepted Answer

A)   is a path used by migratory animals when they move to their winter habitats
B)   is the path most commonly used by an animal within its home range
C)   connects otherwise isolated patches of quality habitat for a species
D)   is a natural component of the environmentE) C) and D)
F) A) and B)

Question 18

Small areas that have a large number of endangered and threatened species are referred to as ______.

Accepted Answer

A)   biologically magnified
B)   endemic environments
C)   biodiverse environments
D)   biodiversity hot spotsE) All of the above
F) A) and D)

Question 19

Populations of two coexisting species are both tertiary consumers in a community. What relationship may exist between these two organisms?

Accepted Answer

A)   predation
B)   mutualism
C)   competition
D)   commensalismE) B) and D)
F) C) and D)

Question 20

E.O.Wilson coined the term ______ for our innate appreciation of wild environments and living organisms.

Accepted Answer

A)   bioremediation
B)   bioethics
C)   biophilia
D)   biophobiaE) None of the above
F) B) and D)

Exam 20: Communities and Ecosystems

Which of these convert organic matter to inorganic matter by breaking down dead organisms?

Correct Answer
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As a result of a severe disturbance,a community will ______.

Correct Answer
verified

On average,what percentage of the energy in one trophic level becomes incorporated into the next higher trophic level?

Correct Answer
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Correct Answer
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A movement corridor ______.

Correct Answer
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The primary goal of conservation biology is to ______.

Correct Answer
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Correct Answer
verified

What is one way in which energy flow differs from chemical cycling?

Correct Answer
verified

Biomass is the total amount of ______ an ecosystem.

Correct Answer
verified

Correct Answer
verified

Why are most food chains limited to three to five trophic levels?

Correct Answer
verified

Small areas that have a large number of endangered and threatened species are referred to as ______.

Correct Answer
verified

Most decomposers are _____.

Correct Answer
verified

The present rate of species loss ______.

Correct Answer
verified

Herbivory is an example of a _____ interaction.

Correct Answer
verified

Sustainable development ______.

Correct Answer
verified

E.O.Wilson coined the term ______ for our innate appreciation of wild environments and living organisms.

Correct Answer
verified

Populations of two coexisting species are both tertiary consumers in a community. What relationship may exist between these two organisms?

Correct Answer
verified

Besides the atmosphere,abiotic reservoirs of carbon dioxide include

Correct Answer
verified

The major abiotic reservoir for phosphorus is ______.

Correct Answer
verified

Exam 20: Communities and Ecosystems

Which of these convert organic matter to inorganic matter by breaking down dead organisms?

Correct AnswerverifiedShow Answer

As a result of a severe disturbance,a community will ______.

Correct AnswerverifiedShow Answer

On average,what percentage of the energy in one trophic level becomes incorporated into the next higher trophic level?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A movement corridor ______.

Correct AnswerverifiedShow Answer

The primary goal of conservation biology is to ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is one way in which energy flow differs from chemical cycling?

Correct AnswerverifiedShow Answer

Biomass is the total amount of ______ an ecosystem.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Why are most food chains limited to three to five trophic levels?

Correct AnswerverifiedShow Answer

Small areas that have a large number of endangered and threatened species are referred to as ______.

Correct AnswerverifiedShow Answer

Most decomposers are _____.

Correct AnswerverifiedShow Answer

The present rate of species loss ______.

Correct AnswerverifiedShow Answer

Herbivory is an example of a _____ interaction.

Correct AnswerverifiedShow Answer

Sustainable development ______.

Correct AnswerverifiedShow Answer

E.O.Wilson coined the term ______ for our innate appreciation of wild environments and living organisms.

Correct AnswerverifiedShow Answer

Populations of two coexisting species are both tertiary consumers in a community. What relationship may exist between these two organisms?

Correct AnswerverifiedShow Answer

Besides the atmosphere,abiotic reservoirs of carbon dioxide include

Correct AnswerverifiedShow Answer

The major abiotic reservoir for phosphorus is ______.

Correct AnswerverifiedShow Answer

Correct Answer
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