Question 1

The organisms living in your front yard represent a(n) _______ while the leafhoppers represent a(n) ______.

Accepted Answer

A)   population; community
B)   population; ecosystem
C)   ecosystem; population
D)   community; population
E)   ecosystem; communityF) C) and D)
G) All of the above

Question 2

An intimate relationship between two species in which coevolution and adaptation occur is

Accepted Answer

A)   competition.
B)   a community.
C)   an ecosystem.
D)   predation.
E)   symbiosis.F) B) and D)
G) B) and E)

Question 3

Farmers sprayed leechi trees to suppress populations of scale insects.This also killed the populations of a predatory lacewing that controlled the numbers of scales.Soon the spraying did no good,and the damage to the leechi from the scales was greater than before spraying had occurred.Few predatory lacewings existed in the trees now because

Accepted Answer

A)   they, too, are insects so they are opportunistic species.
B)   both insects were equilibrium species and resistance was a matter of chance.
C)   the predator was an opportunistic species and was therefore more susceptible to the spray.
D)   the scale insect was an opportunistic species and the high number of young included a resistant strain; the predator was an equilibrium species and will take longer to produce a resistant variety.
E)   they had reached their carrying capacity and thus their numbers decreased due to environmental resistance.F) None of the above
G) A) and C)

Question 4

A scientist observes a population of grasshoppers in a farmer's field several times over the summer.She notices that after each application of an insecticide the grasshopper population increases to its pre-pesticide levels very rapidly and that the population never goes near zero at any time.The scientist's results indicate the grasshopper population is probably

Accepted Answer

A)   in the lag phase.
B)   in the exponential growth phase.
C)   in the deceleration phase.
D)   in the stable equilibrium phase.
E)   at carrying capacity.F) A) and B)
G) A) and C)

Question 5

Which of the following would allow optimal population growth?

Accepted Answer

A)   accumulation of waste products
B)   predation
C)   competition
D)   limited access to food and water
E)   unlimited resourcesF) A) and E)
G) All of the above

Question 6

Which of the following human populations would be expected to have the greatest increase in growth rate?

Accepted Answer

A)   A population with the majority of their population over 50 years of age.
B)   A population with its population distributed equally across all age ranges.
C)   A population with most of its population under the age of 18 years of age.
D)   A population with most of the population in middle age.
E)   A population with most of its population over the age of 18 years of age.F) A) and E)
G) A) and B)

Question 7

The conditions under which an organism survives and exists in the community is called its

Accepted Answer

A)   habitat.
B)   ecological niche.
C)   biotic role.
D)   abiotic role.
E)   ecology.F) B) and D)
G) All of the above

Question 8

In large natural ecosystems,competition between two species over time will usually result in

Accepted Answer

A)   death of all the members of one species within a short time.
B)   equal numbers of each species persisting for a long time.
C)   each species occupying a slightly different niche.
D)   hybridization between the two species, resulting in a third species.
E)   alternating high numbers of each species as they constantly evolve mechanisms to out compete each other.F) A) and C)
G) D) and E)

Question 9

Which of the following is correct when describing a predator-prey cycle?

Accepted Answer

A)   A decline in the numbers of predators causes a decline in the number of prey.
B)   A decline in the numbers 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)   An up-and-down cycle will be seen for the prey animal.
E)   A seasonal die-off that will occur without the other species present.F) A) and E)
G) A) and B)

Question 10

The human growth curve is best described as being

Accepted Answer

A)   flat.
B)   J-shaped.
C)   V-shaped.
D)   S-shaped.
E)   W-shaped.F) B) and D)
G) A) and E)

Question 11

There are two plowed fields that are each one acre and one mile apart with a wood surrounding one and the other surrounded by a pasture; they have the same soil composition and climate.In the first field as succession begins the pioneer species are pine trees and shrubs.In the second field the pioneer species are weeds and shrubs.This provides evidence for which model of succession?

Accepted Answer

A)   The facilitation model
B)   The tolerance model
C)   The inhibition model
D)   An opportunistic model
E)   The climax modelF) A) and D)
G) A) and E)

Question 12

When the number of births exceeds the number of deaths,this results in

Accepted Answer

A)   population growth.
B)   biotic potential.
C)   environmental resistance.
D)   carrying capacity.
E)   doubling time.F) B) and D)
G) B) and E)

Question 13

Which of the following is NOT a form of environmental resistance?

Accepted Answer

A)   limited food supply
B)   accumulation of waste products
C)   number of offspring produced per litter
D)   predation
E)   limited living spaceF) A) and B)
G) C) and E)

Question 14

Explain the correct sequence of events in secondary succession of a forest.

Accepted Answer

During secondary succession there is alr...

Question 15

An example of commensalism is

Accepted Answer

A)   mycorrhizal fungal roots on the roots of plants.
B)   ants living on the bullhorn acacia tree.
C)   termites with protozoa in their digestive tracts.
D)   flowering plants and their pollinators.
E)   clown fishes in sea anemones.F) None of the above
G) C) and D)

Question 16

Age structure diagrams with a broad base suggest that

Accepted Answer

A)   the population will continue to grow for some time.
B)   environmental resistance is not at work.
C)   the biotic potential must be larger than usual.
D)   the individuals must be larger than usual.
E)   there are many older individuals in a population.F) D) and E)
G) A) and B)

Question 17

Which is NOT a parasitic relationship?

Accepted Answer

A)   The Dutch elm disease fungus infects and kills elm trees.
B)   The yellow fever virus causes fever and sometimes kills humans.
C)   A female tick fastens to the skin of a human host and draws blood for nutrition to make her eggs.
D)   The trichina worm burrows into muscle tissue, forms a cyst, and waits to continue its cycle until a predator consumes the host.
E)   Unsightly dandelions sprout in a yard and compete with the fescue grass for sunlight.F) B) and E)
G) All of the above

Question 18

If the growth rate of a population increases,the doubling time

Accepted Answer

A)   increases.
B)   decreases.
C)   remains the same.
D)   depends on the amount of natural resources.
E)   is not related to growth rate increase.F) B) and E)
G) B) and D)

Question 19

Parasites are found

Accepted Answer

A)   only as viruses, bacteria, and protists.
B)   only as viruses, bacteria, protists, and animals; no plants are parasites because they cannot move.
C)   only on host animals.
D)   only on one host where they can complete their life cycle and disperse to others of that same species.
E)   in all kingdoms and sometimes one parasite uses more than one host to disperse.F) B) and C)
G) C) and D)

Question 20

Which of the following describes a type II survivorship curve (drawn by plotting the number of individuals in a given population alive at the beginning of each age interval) ?

Accepted Answer

A)   Most individuals die of old age.
B)   Many individuals die early in life.
C)   Individuals die at a constant rate throughout time.
D)   Most individuals die during their reproductive years.
E)   Most individuals die before old age, but after their reproductive years.F) A) and E)
G) A) and C)

Exam 34: Population and Community Ecology

Correct Answer
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Which of the following is NOT a form of environmental resistance?

Correct Answer
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Which of the following would allow optimal population growth?

Correct Answer
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The conditions under which an organism survives and exists in the community is called its

Correct Answer
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The organisms living in your front yard represent a(n) _ while the leafhoppers represent a(n) .

Correct Answer
verified

When the number of births exceeds the number of deaths,this results in

Correct Answer
verified

In large natural ecosystems,competition between two species over time will usually result in

Correct Answer
verified

The human growth curve is best described as being

Correct Answer
verified

Which of the following describes a type II survivorship curve (drawn by plotting the number of individuals in a given population alive at the beginning of each age interval) ?

Correct Answer
verified

Correct Answer
verified

An example of commensalism is

Correct Answer
verified

Age structure diagrams with a broad base suggest that

Correct Answer
verified

Explain the correct sequence of events in secondary succession of a forest.

Correct Answer
verified
During secondary succession there is alr...
View Answer

An intimate relationship between two species in which coevolution and adaptation occur is

Correct Answer
verified

Which is NOT a parasitic relationship?

Correct Answer
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Which of the following is correct when describing a predator-prey cycle?

Correct Answer
verified

If the growth rate of a population increases,the doubling time

Correct Answer
verified

Correct Answer
verified

Parasites are found

Correct Answer
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Which of the following human populations would be expected to have the greatest increase in growth rate?

Correct Answer
verified

Exam 34: Population and Community Ecology

Correct AnswerverifiedShow Answer

Which of the following is NOT a form of environmental resistance?

Correct AnswerverifiedShow Answer

Which of the following would allow optimal population growth?

Correct AnswerverifiedShow Answer

The conditions under which an organism survives and exists in the community is called its

Correct AnswerverifiedShow Answer

The organisms living in your front yard represent a(n) _______ while the leafhoppers represent a(n) ______.

Correct AnswerverifiedShow Answer

When the number of births exceeds the number of deaths,this results in

Correct AnswerverifiedShow Answer

In large natural ecosystems,competition between two species over time will usually result in

Correct AnswerverifiedShow Answer

The human growth curve is best described as being

Correct AnswerverifiedShow Answer

Which of the following describes a type II survivorship curve (drawn by plotting the number of individuals in a given population alive at the beginning of each age interval) ?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An example of commensalism is

Correct AnswerverifiedShow Answer

Age structure diagrams with a broad base suggest that

Correct AnswerverifiedShow Answer

Explain the correct sequence of events in secondary succession of a forest.

Correct AnswerverifiedDuring secondary succession there is alr...View AnswerShow Answer

An intimate relationship between two species in which coevolution and adaptation occur is

Correct AnswerverifiedShow Answer

Which is NOT a parasitic relationship?

Correct AnswerverifiedShow Answer

Which of the following is correct when describing a predator-prey cycle?

Correct AnswerverifiedShow Answer

If the growth rate of a population increases,the doubling time

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Parasites are found

Correct AnswerverifiedShow Answer

Which of the following human populations would be expected to have the greatest increase in growth rate?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The organisms living in your front yard represent a(n) _ while the leafhoppers represent a(n) .

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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Correct Answer
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During secondary succession there is alr...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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