Question 1

What are some density-dependent factors that affect humans at higher population densities, and how have these been addressed in industrial societies?

Accepted Answer

Competition for all resources increases at high population densities. This leads to an increased mortality rate. Disease, violence, and famine are some of the factors that worsen at high population densities. In industrial societies, sanitation has decreased death by disease. Poverty has been addressed less successfully in industrialized nations and can be viewed as an outcome of competition for resources. War, too, is almost invariably a result of competition for resources, although fighters are often recruited using religious or cultural propaganda.

Question 2

Match each description to an equation.
-per capita death rate

Accepted Answer

A) ÄN/Ät = B - D 
B) dN/dt = (b - d)N 
C) dN/dt = rmaxN 
D) d = (D/N) 
E) dN/dt = rmaxN(K - N)/K 
A) ÄN/Ät = B - D 
B) dN/dt = (b - d)N 
C) dN/dt = rmaxN 
D) d = (D/N) 
E) dN/dt = rmaxN(K - N)/K D

Question 3

Which survivorship curve in the figure best fits humans who live in environments with good medical care?

Accepted Answer

A) type I, shown in graph A 
B) type I, shown in graph C 
C) type III, shown in graph B 
D) type III, shown in graph A 
A) type I, shown in graph A 
B) type I, shown in graph C 
C) type III, shown in graph B 
D) type III, shown in graph A A

Question 4

Match each description to an equation.
-logistic model of population growth

Accepted Answer

A) ÄN/Ät = B - D 
B) dN/dt = (b - d)N 
C) dN/dt = rmaxN 
D) d = (D/N) 
E) dN/dt = rmaxN(K - N)/K 
A) ÄN/Ät = B - D 
B) dN/dt = (b - d)N 
C) dN/dt = rmaxN 
D) d = (D/N) 
E) dN/dt = rmaxN(K - N)/K

Question 5

What does the allocation of resources for survival, growth, and maximal reproduction determine?

Accepted Answer

A) the life history of a species 
B) the survivorship curve of a species 
C) the dispersion of a species 
D) the age-specific fecundity of a species 
A) the life history of a species 
B) the survivorship curve of a species 
C) the dispersion of a species 
D) the age-specific fecundity of a species

Question 6

A cohort is a group of individuals of the same sex.

Accepted Answer

A) True 
 B)False

Question 7

Match each statement with the most appropriate survivorship curve.
-little or no parental care

Accepted Answer

A) type I 
B) type II 
C) type III 
A) type I 
B) type II 
C) type III

Question 8

In the logistic model of population growth, what is expected to happen to r when N > K?

Accepted Answer

A) r will approach rmax 
B) r will be greater than 0 
C) r will approach 1 
D) r will be less than 0 
A) r will approach rmax 
B) r will be greater than 0 
C) r will approach 1 
D) r will be less than 0

Question 9

Which branch of ecology would encompass studies of the flow of energy between a community and the abiotic environment?

Accepted Answer

A) community ecology 
B) ecosystem ecology 
C) biogeography 
D) organismal ecology 
A) community ecology 
B) ecosystem ecology 
C) biogeography 
D) organismal ecology

Question 10

Match each description to an equation.
-exponential model of population growth

Accepted Answer

A) ÄN/Ät = B - D 
B) dN/dt = (b - d)N 
C) dN/dt = rmaxN 
D) d = (D/N) 
E) dN/dt = rmaxN(K - N)/K 
A) ÄN/Ät = B - D 
B) dN/dt = (b - d)N 
C) dN/dt = rmaxN 
D) d = (D/N) 
E) dN/dt = rmaxN(K - N)/K

Question 11

Match each term with its definition.
-emigration

Accepted Answer

A) population increasing steadily by a constant ratio 
B) average number of offspring produced by females during each age interval 
C) population growth slowing as population approaches K 
D) number of individuals per unit area or unit volume 
E) movement out of a population 
A) population increasing steadily by a constant ratio 
B) average number of offspring produced by females during each age interval 
C) population growth slowing as population approaches K 
D) number of individuals per unit area or unit volume 
E) movement out of a population

Question 12

Uniform dispersion usually results from individuals of a species repelling each other.

Accepted Answer

A) True 
 B)False

Question 13

Match each statement with the most appropriate survivorship curve.
-typical of humans

Accepted Answer

A) type I 
B) type II 
C) type III 
A) type I 
B) type II 
C) type III

Question 14

Rabies is a disease that is spread by biting. What causes it?

Accepted Answer

A) a worm 
B) a parasite 
C) a virus 
D) a decomposer 
A) a worm 
B) a parasite 
C) a virus 
D) a decomposer

Question 15

Which of the following is descriptive of a population experiencing exponential population growth?

Accepted Answer

A) The graph of growth produces an S-shaped curve. 
B) ÄN/Ät is increasing. 
C) The population decreases at an increasing rate. 
D) The resources are limited. 
A) The graph of growth produces an S-shaped curve. 
B) ÄN/Ät is increasing. 
C) The population decreases at an increasing rate. 
D) The resources are limited.

Question 16

Use the list of terms to identify each lettered part of the illustration.  
-rapid growth

Accepted Answer

The answer of Use the list of terms to identify...

Question 17

Match each statement with the most appropriate survivorship curve.
-early timing of first reproduction

Accepted Answer

A) type I 
B) type II 
C) type III 
A) type I 
B) type II 
C) type III

Question 18

Suppose that a particular population is expected to show the most growth in the future. What are the features of this population?

Accepted Answer

A) It is composed mostly of prereproductive individuals, with a short generation time and a high proportion of females. 
B) It is composed mostly of prereproductive individuals, with a short generation time and a low proportion of females. 
C) It is composed mostly of reproductive individuals, with a short generation time and a low proportion of females. 
D) It is composed mostly of reproductive individuals, with a short generation time and a high proportion of females. 
A) It is composed mostly of prereproductive individuals, with a short generation time and a high proportion of females. 
B) It is composed mostly of prereproductive individuals, with a short generation time and a low proportion of females. 
C) It is composed mostly of reproductive individuals, with a short generation time and a low proportion of females. 
D) It is composed mostly of reproductive individuals, with a short generation time and a high proportion of females.

Question 19

Match each statement with the most appropriate survivorship curve.
-typical of Cleome droserifolia

Accepted Answer

A) type I 
B) type II 
C) type III 
A) type I 
B) type II 
C) type III

Question 20

Match each statement with the most appropriate survivorship curve.
-extensive parental care

Accepted Answer

A) type I 
B) type II 
C) type III 
A) type I 
B) type II 
C) type III

Exam 29: Population Ecology

What are some density-dependent factors that affect humans at higher population densities, and how have these been addressed in industrial societies?

Match each description to an equation. -per capita death rate

Which survivorship curve in the figure best fits humans who live in environments with good medical care?

Match each description to an equation. -logistic model of population growth

What does the allocation of resources for survival, growth, and maximal reproduction determine?

A cohort is a group of individuals of the same sex.

Match each statement with the most appropriate survivorship curve. -little or no parental care

In the logistic model of population growth, what is expected to happen to r when N > K?

Which branch of ecology would encompass studies of the flow of energy between a community and the abiotic environment?

Match each description to an equation. -exponential model of population growth

Match each term with its definition. -emigration

Uniform dispersion usually results from individuals of a species repelling each other.

Match each statement with the most appropriate survivorship curve. -typical of humans

Rabies is a disease that is spread by biting. What causes it?

Which of the following is descriptive of a population experiencing exponential population growth?

Use the list of terms to identify each lettered part of the illustration. -rapid growth

Match each statement with the most appropriate survivorship curve. -early timing of first reproduction

Suppose that a particular population is expected to show the most growth in the future. What are the features of this population?

Match each statement with the most appropriate survivorship curve. -typical of Cleome droserifolia

Match each statement with the most appropriate survivorship curve. -extensive parental care

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Control of Gene Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

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