Question 1

Which of these diagrams represents an age structure diagram of more-developed countries?

Accepted Answer

A)  Diagram A
B)  Diagram BC) A) and B)
D) undefined

Question 2

Opportunistic species

Accepted Answer

A)  are composed of large individual organisms.
B)  are good dispersers and colonizers of new habitats.
C)  are slow to mature.
D)  have long life spans.
E)  are adapted to stable environments.F) A) and B)
G) C) and E)

Question 3

In the logistic growth curve formula,when N is very large,(K-N) /N is almost equal to 0,which results in

Accepted Answer

A)  the population growing as fast as it can,or r(N) .
B)  the population growth slowing to zero.
C)  the population exceeding carrying capacity; more are dying due to starvation than are born.
D)  the population going extinct.
E)  You can't tell without knowing the value of r (rate of reproduction) .F) A) and C)
G) A) and B)

Question 4

Survivorship may be defined as the probability of newborn individuals of a cohort surviving to a particular age interval or as the proportion of the population surviving from the previous age interval.

Accepted Answer

A) True 
 B)False

Question 5

The carrying capacity of the environment for a species is determined by

Accepted Answer

A)  the reproductive rate of the organism.
B)  the number of organisms of that species.
C)  the state and national wildlife laws pertaining to that species.
D)  the age distribution of that species.
E)  the limited availability of renewable resources in the environment and the environmental resistance to the biotic potential of the organism.F) B) and C)
G) A) and E)

Question 6

Population size levels off at the _______ of an environment.

Accepted Answer

A)  population growth
B)  biotic potential
C)  environmental resistance
D)  carrying capacityE) C) and D)
F) All of the above

Question 7

Consider that a species of salmon lays 20,000 eggs per pair when it spawns and dies.At the end of five years,an average of one pair of mature salmon from this group of hatched eggs returns again to spawn in the parent stream (19,998 have not survived) .What is the growth rate of this population?

Accepted Answer

A)  10,000,because there were that many eggs produced per parent fish (r) 
B)  2,000,because this must be divided by five years
C)  zero,because there is exact replacement of the previous generation
D)  2,000,because there was this much average die-off per year
E)  19,998,because there was this much total lossF) C) and E)
G) A) and B)

Question 8

Parasitism,competition,and predation are density independent factors that help control population size.

Accepted Answer

A) True 
 B)False

Question 9

Intrinsic factors,such as behavior and physiology,may affect growth rates of a population.

Accepted Answer

A) True 
 B)False

Question 10

As the carrying capacity of an environment is approached by a population,

Accepted Answer

A)  births begin to exceed deaths.
B)  deaths begin to exceed births.
C)  the rate of reproduction increases.
D)  population growth begins to be exponential.
E)  density-dependent environmental resistance increases.F) A) and E)
G) A) and C)

Question 11

An ecologist may study

Accepted Answer

A)  the human impact on the Earth's environment.
B)  the different types of organisms living near a hydrothermal vent and how they interact.
C)  the affect of a particular pesticide on a food chain.
D)  how populations are restricted by environmental resistance.
E)  All of the choices are correct.F) A) and C)
G) None of the above

Question 12

All of the following factors will keep a population from growing at its biotic potential EXCEPT

Accepted Answer

A)  limited supply of food and water.
B)  lack of availability of space.
C)  abundance of predators.
D)  prevalence of disease or parasites.
E)  successful reproduction of its members.F) B) and D)
G) A) and B)

Question 13

The maximum rate of natural increase of a population that occurs under ideal conditions is the

Accepted Answer

A)  population growth.
B)  biotic potential.
C)  environmental resistance.
D)  carrying capacity.
E)  density-independent population.F) C) and D)
G) A) and D)

Question 14

The population growth rate is negative when

Accepted Answer

A)  birthrate is greater than death rate.
B)  death rate is greater than birth rate.
C)  all couples are married but average fewer than two children apiece.
D)  a country becomes poorer,because it is related to economic growth.
E)  better health care reduces the death rate and increases survivorship of newborns.F) A) and E)
G) C) and D)

Question 15

When discussing population features a cohort is described as

Accepted Answer

A)  all the individuals in a population born at the same time.
B)  all individuals living in the same habitat.
C)  all the different species in a community.
D)  all the organisms interacting in the ecosystem.
E)  All of the choices are correct.F) A) and B)
G) B) and C)

Question 16

What is the expected pattern of growth for a population that has a birthrate that is higher than the death rate?

Accepted Answer

A)  This population can expect to see a pyramid-shaped diagram that will cause the population to grow in the near future.
B)  This population can expect to see an urn-shaped diagram that will cause the population to grow in the future.
C)  This population can expect to see a bell-shaped diagram that will cause the population to grow in the future.
D)  This population can expect to see an pyramid-shaped diagram that will cause the population to decrease in the future.
E)  This population can expect to move into a logistic growth curve in the near future.F) A) and E)
G) A) and D)

Question 17

Density-independent factors which play a role in regulating population size in nature include

Accepted Answer

A)  weather.
B)  natural disasters.
C)  geographical barriers.
D)  All of the choices are correct.E) None of the above
F) B) and C)

Question 18

Bangladesh has 2596 persons per square mile,while the United States has 780 persons per square mile and Canada has 9 persons per square mile.These statistics compare the _____ of these countries.

Accepted Answer

A)  population densities
B)  population distributions
C)  carrying capacities
D)  rate of natural increase
E)  limiting factorsF) B) and E)
G) C) and D)

Question 19

Zero population growth will be achieved as soon as couples have only replacement reproduction,with two children per couple.

Accepted Answer

A) True 
 B)False

Question 20

In a population with low death rates,this age structure diagram indicates that

Accepted Answer

A)  the population is decreasing.
B)  the population is stable.
C)  the biotic potential must be larger than usual.
D)  the population will continue to grow for some time.E) C) and D)
F) All of the above

Exam 44: Population Ecology

Intrinsic factors,such as behavior and physiology,may affect growth rates of a population.

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Zero population growth will be achieved as soon as couples have only replacement reproduction,with two children per couple.

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When discussing population features a cohort is described as

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An ecologist may study

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The population growth rate is negative when

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In the logistic growth curve formula,when N is very large,(K-N) /N is almost equal to 0,which results in

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The carrying capacity of the environment for a species is determined by

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Consider that a species of salmon lays 20,000 eggs per pair when it spawns and dies.At the end of five years,an average of one pair of mature salmon from this group of hatched eggs returns again to spawn in the parent stream (19,998 have not survived) .What is the growth rate of this population?

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What is the expected pattern of growth for a population that has a birthrate that is higher than the death rate?

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The maximum rate of natural increase of a population that occurs under ideal conditions is the

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Opportunistic species

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Bangladesh has 2596 persons per square mile,while the United States has 780 persons per square mile and Canada has 9 persons per square mile.These statistics compare the _____ of these countries.

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In a population with low death rates,this age structure diagram indicates that

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Population size levels off at the _______ of an environment.

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Density-independent factors which play a role in regulating population size in nature include

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Survivorship may be defined as the probability of newborn individuals of a cohort surviving to a particular age interval or as the proportion of the population surviving from the previous age interval.

Correct AnswerverifiedShow Answer

Parasitism,competition,and predation are density independent factors that help control population size.

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Which of these diagrams represents an age structure diagram of more-developed countries?

Correct AnswerverifiedShow Answer

As the carrying capacity of an environment is approached by a population,

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All of the following factors will keep a population from growing at its biotic potential EXCEPT

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