Question 1

An ecosystem contains

Accepted Answer

A)  only the biotic components of the local environment.
B)  only the abiotic components of the local environment.
C)  only the energy flow components of the local environment.
D)  both the biotic and the abiotic components of the local environment.
E)  only the food relationships found in the local environment.F) A) and E)
G) C) and D)

Question 2

Which of the following is (are) correct in a predator-prey cycle?

Accepted Answer

A)  A decline in the number of predators causes a decline in the number of prey.
B)  A decline in the number of prey causes a decline in the number of predators.
C)  An increase in the number of predators triggers an increase in the number of prey.
D)  All of these are correct,causing an up-and-down cycle for each animal.E) C) and D)
F) A) and B)

Question 3

There are several species of grain beetles that live on dry meal and do considerable damage to stored grain.In an experiment,a dozen jars of dry meal are set up and fifty individuals of each species,both males and females,are added to each jar.The food supply is not quite sufficient to last for six months and the size of the jar is adequate so that wastes do not become toxic.Most likely,examination of the jars in six months will find

Accepted Answer

A)  a totally random variation in numbers of both beetles.
B)  only one species per jar.
C)  the same ratio of beetles as when you started (about half from each species) .
D)  only dead beetles in all jars due to intense competition for the niche.E) B) and C)
F) A) and D)

Question 4

Approximately what percentage of the energy in one trophic level is incorporated into the next trophic level?

Accepted Answer

A)  1%
B)  10%
C)  30%
D)  60%
E)  100%F) A) and D)
G) All of the above

Question 5

Excluding humans,which group of organisms is most likely to change the abiotic factors within an ecosystem?

Accepted Answer

A)  producers
B)  herbivores
C)  detritivores
D)  None of these can change the abiotic factors within an ecosystem.
E)  All of these can change the abiotic factors within an ecosystem.F) A) and C)
G) A) and B)

Question 6

Which of the following statements about ecological pyramids is true?

Accepted Answer

A)  Pyramids built upon the biomass of organisms at each level eliminate size as a factor.
B)  Energy gains between trophic levels occur based upon biomass conversion.
C)  The limited number of trophic levels in an ecological pyramid is due to increasing complexity and size of organisms at each greater trophic level.
D)  A pyramid of organism numbers will always have a large base and a small top.
E)  None of the choices are true.F) A) and D)
G) A) and C)

Question 7

Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is

Accepted Answer

A)  possible only if you are a cannibal.
B)  possible since carbon cycles through the biosphere.
C)  impossible since carbon can't enter a living system more than once.
D)  highly unlikely since carbon is always tied up in molecules in organisms or minerals.E) A) and D)
F) None of the above

Question 8

The actual conditions under which an organism exists in nature constitute its

Accepted Answer

A)  habitat.
B)  realized niche.
C)  fundamental niche.
D)  resource partition.E) B) and D)
F) A) and D)

Question 9

Over two decades ago in the People's Republic of China,it was noticed that songbirds were eating rice and millet drying on the grain floors.Since there were large numbers of people to feed,and the population was very near to carrying capacity,it was proposed that the songbird population should be reduced in order to preserve more grain.However,the songbirds also ate a larger number of insects that fed on the rice and millet when it was young.Draw a food web including the above items,indicating energy flow in the direction of the arrows,and representing the general proportion of energy consumed by the breadth of each arrow.State briefly why this decision was disastrous.

Accepted Answer

In this scenario,rice and millet are con...

Question 10

Which of the following associations between organism and nutrient source is incorrect?

Accepted Answer

A)  raccoons - omnivores
B)  cows - herbivores
C)  earthworms - detritivores
D)  bacteria - decomposers
E)  humans - carnivoresF) A) and E)
G) None of the above

Question 11

________ occurs when one living organism feeds on another.

Accepted Answer

A)  Competition
B)  Mimicry
C)  Commensalism
D)  Predation
E)  SymbiosisF) B) and C)
G) All of the above

Question 12

The frequent change in HIV surface proteins is a type of

Accepted Answer

A)  coevolution.
B)  parasitism.
C)  mutualism.
D)  commensalism.E) B) and C)
F) All of the above

Question 13

Chemical cycling may involve all but which of the following?

Accepted Answer

A)  a reservoir unavailable to producers
B)  an exchange pool as a source from which organisms can acquire chemicals
C)  a biotic community in which chemicals move through food chains
D)  a geological component,in which chemicals move through the soil or the air
E)  All of the choices are correct.F) A) and B)
G) B) and E)

Question 14

_____ is the interaction between two species as both attempt to use the same environmental resources that are in limited supply.

Accepted Answer

A)  Competition
B)  A community
C)  An ecosystem
D)  Predation
E)  SymbiosisF) C) and D)
G) D) and E)

Question 15

Hurricanes and other severe precipitation events have started becoming weaker and less intense as a result of climate change.

Accepted Answer

A) True 
 B)False

Question 16

Ecologist Robert MacArthur observed that five species of similar warblers coexisted on spruce trees because they

Accepted Answer

A)  ate different kinds of insects.
B)  cooperated in their foraging habits.
C)  foraged in different places of the tree canopy.
D)  were actually subspecies of the same species.
E)  were kept below the carrying capacity by predators.F) A) and E)
G) C) and E)

Question 17

What is the correct sequence of organisms if a community is going through secondary succession?
 a.grasses establish themselves in the community
B.shrubs establish themselves in the community
C.soil formation occurs
D.trees establish themselves in the community

Accepted Answer

A)  c - a - b - d
B)  a - b - c - d
C)  d - c - a - b
D)  c - a - d - b
E)  a - c - b - dF) A) and C)
G) A) and E)

Question 18

Which of the following statements about the value of the nitrogen cycle to an ecosystem is NOT true?

Accepted Answer

A)  Denitrification removes nitrogen from the atmosphere and converts it to a form that plants can use.
B)  Nitrogen fixation can occur in aquatic systems or in soil bacteria.
C)  Nitrification occurs as ammonium is converted to nitrate.
D)  Nitrification occurs as nitrogen gas is converted to nitrate.
E)  Both ammonium and nitrate ions are highly water-solubleF) None of the above
G) B) and E)

Question 19

Which of the following statements about parasitism is NOT true?

Accepted Answer

A)  The host is generally larger than the parasite.
B)  An efficient parasite usually kills its host.
C)  Smaller parasites often live as endoparasites within the body of the host.
D)  Ectoparasites are attached to the outside of the host's body by specialized organs.
E)  Some organisms and all viruses are obligate parasites and must live inside a host.F) A) and E)
G) A) and D)

Question 20

All food chains begin with a photosynthetic producer.

Accepted Answer

A) True 
 B)False

Exam 45: Community and Ecosystem Ecology

Which of the following statements about the value of the nitrogen cycle to an ecosystem is NOT true?

Correct Answer
verified

Excluding humans,which group of organisms is most likely to change the abiotic factors within an ecosystem?

Correct Answer
verified

An ecosystem contains

Correct Answer
verified

The frequent change in HIV surface proteins is a type of

Correct Answer
verified

Chemical cycling may involve all but which of the following?

Correct Answer
verified

Hurricanes and other severe precipitation events have started becoming weaker and less intense as a result of climate change.

Correct Answer
verified

Ecologist Robert MacArthur observed that five species of similar warblers coexisted on spruce trees because they

Correct Answer
verified

Approximately what percentage of the energy in one trophic level is incorporated into the next trophic level?

Correct Answer
verified

Which of the following is (are) correct in a predator-prey cycle?

Correct Answer
verified

All food chains begin with a photosynthetic producer.

Correct Answer
verified

Which of the following associations between organism and nutrient source is incorrect?

Correct Answer
verified

Correct Answer
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In this scenario,rice and millet are con...
View Answer

________ occurs when one living organism feeds on another.

Correct Answer
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Which of the following statements about ecological pyramids is true?

Correct Answer
verified

_____ is the interaction between two species as both attempt to use the same environmental resources that are in limited supply.

Correct Answer
verified

Correct Answer
verified

Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is

Correct Answer
verified

What is the correct sequence of organisms if a community is going through secondary succession? a.grasses establish themselves in the community B.shrubs establish themselves in the community C.soil formation occurs D.trees establish themselves in the community

Correct Answer
verified

The actual conditions under which an organism exists in nature constitute its

Correct Answer
verified

Which of the following statements about parasitism is NOT true?

Correct Answer
verified

Exam 45: Community and Ecosystem Ecology

Which of the following statements about the value of the nitrogen cycle to an ecosystem is NOT true?

Correct AnswerverifiedShow Answer

Excluding humans,which group of organisms is most likely to change the abiotic factors within an ecosystem?

Correct AnswerverifiedShow Answer

An ecosystem contains

Correct AnswerverifiedShow Answer

The frequent change in HIV surface proteins is a type of

Correct AnswerverifiedShow Answer

Chemical cycling may involve all but which of the following?

Correct AnswerverifiedShow Answer

Hurricanes and other severe precipitation events have started becoming weaker and less intense as a result of climate change.

Correct AnswerverifiedShow Answer

Ecologist Robert MacArthur observed that five species of similar warblers coexisted on spruce trees because they

Correct AnswerverifiedShow Answer

Approximately what percentage of the energy in one trophic level is incorporated into the next trophic level?

Correct AnswerverifiedShow Answer

Which of the following is (are) correct in a predator-prey cycle?

Correct AnswerverifiedShow Answer

All food chains begin with a photosynthetic producer.

Correct AnswerverifiedShow Answer

Which of the following associations between organism and nutrient source is incorrect?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedIn this scenario,rice and millet are con...View AnswerShow Answer

________ occurs when one living organism feeds on another.

Correct AnswerverifiedShow Answer

Which of the following statements about ecological pyramids is true?

Correct AnswerverifiedShow Answer

_____ is the interaction between two species as both attempt to use the same environmental resources that are in limited supply.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is

Correct AnswerverifiedShow Answer

What is the correct sequence of organisms if a community is going through secondary succession? a.grasses establish themselves in the community B.shrubs establish themselves in the community C.soil formation occurs D.trees establish themselves in the community

Correct AnswerverifiedShow Answer

The actual conditions under which an organism exists in nature constitute its

Correct AnswerverifiedShow Answer

Which of the following statements about parasitism is NOT true?

Correct AnswerverifiedShow Answer

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In this scenario,rice and millet are con...
View Answer

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