Question 1

From the perspective of population growth,what three major age groups does a population contain? Draw three age structure diagrams that roughly depict the proportion of these three age groups in an increasing population,a stable population,and a decreasing population.

Accepted Answer

The three age groups are those...

Question 2

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 3

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 E)
G) C) and D)

Question 4

When the number of births plus immigration exceeds the number of deaths plus emigration,a population size will increase.

Accepted Answer

A) True 
 B)False

Question 5

What is the age structure diagram for a population that has a birthrate higher than its death rate and larger population in prereproductive ages than in reproductive and postreproductive ages?

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 a 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) None of the above
G) A) and B)

Question 6

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 7

Bangladesh has 2,596 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) A) and D)
G) B) and E)

Question 8

Which of the following studies would lie outside of an ecologist's skill set?

Accepted Answer

A)  Studying the progression of an outbreak of HIV in sub-Saharan Africa.
B)  Developing a management plan for the preservation of an endangered species.
C)  Proposal to develop a solar power field on the edge of a major urban area.
D)  Management plan to clean up a section of the Mississippi River that has become polluted due to sewage discharge.
E)  All of these are part of an ecologist's skill set.F) C) and D)
G) A) and C)

Question 9

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) All of the above
F) A) and D)

Question 10

Tell what type of growth model is depicted in the graph and describe the factors that must be met for a population to experience this type of growth.Identify the labeled phases "A," "B," "C," and "D" and briefly explain what occurs during these phases.

Accepted Answer

This is a logistic growth curve.This typ...

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Identify the distribution patterns of the desert shrubs in each picture.

Accepted Answer

A.clumped ...

Question 13

The basic level of an ecological study always begins by looking at how populations interact with each other.

Accepted Answer

A) True 
 B)False

Question 14

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 space.
C)  abundance of predators.
D)  prevalence of disease or parasites.
E)  successful reproduction of its members.F) A) and D)
G) A) and E)

Question 15

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 16

A type II survivorship curve,drawn by plotting the number of individuals in a given population alive at the beginning of each age interval,is characterized by

Accepted Answer

A)  most individuals dying of old age.
B)  many individuals dying early in life.
C)  individuals dying at a constant rate throughout time.
D)  most individuals dying during their reproductive years.E) B) and C)
F) A) and D)

Question 17

The particular place where an organism lives is its

Accepted Answer

A)  life zone.
B)  niche.
C)  ecosystem.
D)  community.
E)  habitat.F) B) and E)
G) C) and D)

Question 18

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 effect of a particular pesticide on a food chain.
D)  how populations are restricted by environmental resistance.
E)  All of the choices are correct.F) All of the above
G) A) and E)

Question 19

Many species are held below the environmental carrying capacity by predation.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following factor(s) limit(s) exponential growth of a population?

Accepted Answer

A)  limited resource availability
B)  increases in predator populations
C)  competition between members
D)  competition with other species
E)  All of these choices limit exponential growth.F) All of the above
G) B) and C)

Exam 44: Population Ecology

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

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The particular place where an organism lives is its

Correct AnswerverifiedShow Answer

Many species are held below the environmental carrying capacity by predation.

Correct AnswerverifiedShow Answer

Bangladesh has 2,596 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.

Correct AnswerverifiedShow Answer

Identify the distribution patterns of the desert shrubs in each picture.

Correct AnswerverifiedA.clumped ...View AnswerShow Answer

What is the age structure diagram for a population that has a birthrate higher than its death rate and larger population in prereproductive ages than in reproductive and postreproductive ages?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

From the perspective of population growth,what three major age groups does a population contain? Draw three age structure diagrams that roughly depict the proportion of these three age groups in an increasing population,a stable population,and a decreasing population.

Correct AnswerverifiedThe three age groups are those...View AnswerShow Answer

Which of the following studies would lie outside of an ecologist's skill set?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

Opportunistic species

Correct AnswerverifiedShow Answer

Which of the following factor(s) limit(s) exponential growth of a population?

Correct AnswerverifiedShow Answer

When the number of births plus immigration exceeds the number of deaths plus emigration,a population size will increase.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Tell what type of growth model is depicted in the graph and describe the factors that must be met for a population to experience this type of growth.Identify the labeled phases "A," "B," "C," and "D" and briefly explain what occurs during these phases.

Correct AnswerverifiedThis is a logistic growth curve.This typ...View AnswerShow Answer

The basic level of an ecological study always begins by looking at how populations interact with each other.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A type II survivorship curve,drawn by plotting the number of individuals in a given population alive at the beginning of each age interval,is characterized by

Correct AnswerverifiedShow Answer

An ecologist may study

Correct AnswerverifiedShow Answer

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A.clumped ...
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The three age groups are those...
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This is a logistic growth curve.This typ...
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