Question 1

Energy flow in an ecosystem is not cyclic because energy is

Accepted Answer

A)   destroyed as it is used.
B)   evenly spread out over many organisms.
C)   converted to many kinds of useful energy.
D)   increased as you go up the energy pyramid.
E)   converted to heat, which is no longer useful.F) B) and D)
G) A) and D)

Question 2

The frequent change in HIV surface proteins is a type of

Accepted Answer

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

Question 3

All the populations of all the different species interacting with one another in the same environment is called

Accepted Answer

A)   diversity.
B)   a community.
C)   an ecosystem.
D)   predation.
E)   symbiosis.F) B) and D)
G) All of the above

Question 4

Primary succession takes much longer than secondary succession because it involves

Accepted Answer

A)   colonization by more K-selected species.
B)   time for development of the soil.
C)   more time for development of a seed bank.
D)   colonization by organisms that are farther away.
E)   redevelopment of the atmospheric gases.F) None of the above
G) C) and D)

Question 5

Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200) . Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, hawk: 300) .
How many clover plants, per day, does it take to support a family of hawks (mom, dad and juvenile. Assume each hawk needs the same number of calories per day) ?

Accepted Answer

A)   approximately 1800 clover plants
B)   approximately 600 clover plants
C)   approximately 100 clover plants
D)   approximately 18,000 clover plants
E)   None, hawks do not eat clover plants.F) A) and E)
G) None of the above

Question 6

If there are 12,000kg in the base of an ecological pyramid, how many kg will be found in the body tissue of the tertiary consumers?

Accepted Answer

A)   1200 kg
B)   120 kg
C)   12000 kg
D)   6000 kg
E)   12 kgF) A) and E)
G) A) and D)

Question 7

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 an 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) D) and E)
G) A) and D)

Question 8

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) All of the above
F) None of the above

Question 9

Which of the following pairings of organisms and their method of obtaining nutrients is incorrect?

Accepted Answer

A)   autotrophs - chemosynthesis
B)   herbivores - algae
C)   detritivores - inorganic matter
D)   carnivores - other animalsE) A) and D)
F) A) and C)

Question 10

Organisms in all trophic levels may be consumed by decomposers.

Accepted Answer

A) True 
 B)False

Question 11

As animals take in food energy approximately 10% of it is made available to the next level in the food chain. Which of the following is one of the ways in which the energy is used by the organism and not passed along?

Accepted Answer

A)   cellular respiration
B)   defecation
C)   excretion
D)   death
E)   All of these are ways in which the organism uses the energy.F) All of the above
G) A) and B)

Question 12

What is the correct order of events during primary succession?

Accepted Answer

A)   Soil formation occurs - pioneer species enter the region, shrubs begin to grow - small trees begin to grow
B)   pioneer species enter the region, soil formation occurs, shrubs begin to grow - small trees begin to grow
C)   pioneer species enter the region, shrubs begin to grow - small trees begin to grow
D)   pioneer species enter the region, climax status is reached- small trees begin to growE) B) and D)
F) B) and C)

Question 13

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) C) and E)
G) A) and E)

Question 14

_____ occurs when one living organism feeds on another.

Accepted Answer

A)   Competition
B)   Mimicry
C)   Commensalism
D)   Predation
E)   SymbiosisF) A) and B)
G) A) and C)

Question 15

In order for a community to reach the status of climax community, succession must always begin with pioneer species.

Accepted Answer

A) True 
 B)False

Question 16

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) C) and E)
G) A) and E)

Question 17

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) C) and E)
G) None of the above

Question 18

MacArthur discovered that five species of warblers coexisted on spruce trees by foraging on the same caterpillar, but in different places of the tree canopy. This is

Accepted Answer

A)   an exception to the competitive exclusion principle.
B)   an exception based on birds taking longer to eventually compete and eliminate competitors.
C)   confirmation that all warblers were actually variations of the same species because different species couldn't coexist.
D)   an example of resource partitioning.E) C) and D)
F) A) and D)

Question 19

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 B)
F) A) and C)

Question 20

In a grazing food chain,

Accepted Answer

A)   primary consumers eat detritus.
B)   primary consumers eat photosynthetic organisms.
C)   secondary consumers eat detritus.
D)   secondary consumers eat photosynthetic organisms.
E)   all the consumers are primary consumers.F) B) and E)
G) D) and E)

Exam 45: Community and Ecosystem Ecology

All the populations of all the different species interacting with one another in the same environment is called

Correct Answer
verified

Energy flow in an ecosystem is not cyclic because energy is

Correct Answer
verified

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

Correct Answer
verified

As animals take in food energy approximately 10% of it is made available to the next level in the food chain. Which of the following is one of the ways in which the energy is used by the organism and not passed along?

Correct Answer
verified

What is the correct order of events during primary succession?

Correct Answer
verified

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

Correct Answer
verified

_____ occurs when one living organism feeds on another.

Correct Answer
verified

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

Correct Answer
verified

The frequent change in HIV surface proteins is a type of

Correct Answer
verified

Correct Answer
verified

MacArthur discovered that five species of warblers coexisted on spruce trees by foraging on the same caterpillar, but in different places of the tree canopy. This is

Correct Answer
verified

If there are 12,000kg in the base of an ecological pyramid, how many kg will be found in the body tissue of the tertiary consumers?

Correct Answer
verified

Correct Answer
verified

Organisms in all trophic levels may be consumed by decomposers.

Correct Answer
verified

In order for a community to reach the status of climax community, succession must always begin with pioneer species.

Correct Answer
verified

An ecosystem contains

Correct Answer
verified

Which of the following pairings of organisms and their method of obtaining nutrients is incorrect?

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

Primary succession takes much longer than secondary succession because it involves

Correct Answer
verified

In a grazing food chain,

Correct Answer
verified

Exam 45: Community and Ecosystem Ecology

All the populations of all the different species interacting with one another in the same environment is called

Correct AnswerverifiedShow Answer

Energy flow in an ecosystem is not cyclic because energy is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

As animals take in food energy approximately 10% of it is made available to the next level in the food chain. Which of the following is one of the ways in which the energy is used by the organism and not passed along?

Correct AnswerverifiedShow Answer

What is the correct order of events during primary succession?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

_____ occurs when one living organism feeds on another.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The frequent change in HIV surface proteins is a type of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

MacArthur discovered that five species of warblers coexisted on spruce trees by foraging on the same caterpillar, but in different places of the tree canopy. This is

Correct AnswerverifiedShow Answer

If there are 12,000kg in the base of an ecological pyramid, how many kg will be found in the body tissue of the tertiary consumers?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Organisms in all trophic levels may be consumed by decomposers.

Correct AnswerverifiedShow Answer

In order for a community to reach the status of climax community, succession must always begin with pioneer species.

Correct AnswerverifiedShow Answer

An ecosystem contains

Correct AnswerverifiedShow Answer

Which of the following pairings of organisms and their method of obtaining nutrients is incorrect?

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

Primary succession takes much longer than secondary succession because it involves

Correct AnswerverifiedShow Answer

In a grazing food chain,

Correct AnswerverifiedShow Answer

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