Question 1

A group of individuals born at the same time is known as a

Accepted Answer

A)  deme. 
B)  subpopulation. 
C)  Mendelian population. 
D)  cohort. 
E)  taxon. 
A)  deme. 
B)  subpopulation. 
C)  Mendelian population. 
D)  cohort. 
E)  taxon. D

Question 2

How do the demographic traits of fish and whales influence how these marine resources respond to overexploitation?

Accepted Answer

Although stocks of many fish and many whale species have been overexploited, the recovery of fish populations is potentially faster because most species of fish have high reproductive capacities. In contrast, whales, as marine mammals, reproduce at very low rates, and therefore recover more slowly from overexploitation (see Figure 55.13).

Question 3

Which of the following statements about the intrinsic rate of increase is false?

Accepted Answer

A)  It is symbolized as r. 
B)  It is equal to the birth rate minus the death rate (assuming no migration). 
C)  It is always positive (above zero). 
D)  It can be calculated from life tables. 
E)  All of the above are true; none is false. 
A)  It is symbolized as r. 
B)  It is equal to the birth rate minus the death rate (assuming no migration). 
C)  It is always positive (above zero). 
D)  It can be calculated from life tables. 
E)  All of the above are true; none is false. C

Question 4

If the birth rate is 0.05 and the death rate is 0.02, the intrinsic rate of increase (assuming that there is no immigration or emigration)

Accepted Answer

A)  is 0.02. 
B)  is 0.03. 
C)  is 0.05. 
D)  is 0.07. 
E)  cannot be calculated. 
A)  is 0.02. 
B)  is 0.03. 
C)  is 0.05. 
D)  is 0.07. 
E)  cannot be calculated.

Question 5

Use the following to answer questions:
Suppose that of 300 mice in a mice colony born in January, 150 are still alive at the start of September, and 120 are still alive at the start of October.
-What is the survivorship up to the start of September?

Accepted Answer

A)  0.15 
B)  0.30 
C)  0.45 
D)  0.50 
E)  0.60 
A)  0.15 
B)  0.30 
C)  0.45 
D)  0.50 
E)  0.60

Question 6

Use the following to answer questions :
Refer to the graph below.  
-At which point in the graph would there be zero population growth (dN/dt = 0)?

Accepted Answer

The answer of Use the following to answer questions :
Refer...

Question 7

When a single bacterium is placed in a culture vessel, the resulting population at first grows very quickly; however, as the population expands and uses up its resources, the growth rate eventually slows down and stops. This growth pattern is best modeled mathematically as _______ growth.

Accepted Answer

The answer of When a single bacterium is placed in...

Question 8

In an effort to measure the size of a bluegill population in a pond, you capture 40 bluegills and mark each with a tag on the tail fin and then release them. A week later you return to the pond and catch 40 more, of which 8 have a tag on the tail fin. What is the best estimate of the bluegill population in the pond?

Accepted Answer

A)  100 
B)  160 
C)  200 
D)  320 
E)  400 
A)  100 
B)  160 
C)  200 
D)  320 
E)  400

Question 9

Which of the following attributes tends to promote stability in population numbers?

Accepted Answer

A)  Long life span of individuals 
B)  Small size of the population 
C)  High reproductive rates 
D)  Dependence on a single resource 
E)  None of the above 
A)  Long life span of individuals 
B)  Small size of the population 
C)  High reproductive rates 
D)  Dependence on a single resource 
E)  None of the above

Question 10

The logistic growth equation describes a population that

Accepted Answer

A)  grows without limits. 
B)  grows rapidly at small population sizes, but whose growth rate slows and eventually stops as it reaches the number the environment can support. 
C)  rapidly overshoots the number the environment can support and then fluctuates around this number. 
D)  grows very rapidly and then crashes when environmental resources are depleted. 
E)  is declining in size. 
A)  grows without limits. 
B)  grows rapidly at small population sizes, but whose growth rate slows and eventually stops as it reaches the number the environment can support. 
C)  rapidly overshoots the number the environment can support and then fluctuates around this number. 
D)  grows very rapidly and then crashes when environmental resources are depleted. 
E)  is declining in size.

Question 11

Intensive fishing of the rockfish led to the evolution of _______ fish because _______ fish were selectively caught.

Accepted Answer

A)  larger; smaller 
B)  larger; larger 
C)  smaller; larger 
D)  smaller; smaller 
E)  more oily; more oily 
A)  larger; smaller 
B)  larger; larger 
C)  smaller; larger 
D)  smaller; smaller 
E)  more oily; more oily

Question 12

Which of the following is not an assumption of the logistic growth equation?

Accepted Answer

A)  An individual exerts its effects on resources immediately at birth. 
B)  All individuals produce equal effects. 
C)  Resources in the environment are limited. 
D)  Each individual depresses population growth equally. 
E)  There is a substantial time lag between gathering resources and reproduction. 
A)  An individual exerts its effects on resources immediately at birth. 
B)  All individuals produce equal effects. 
C)  Resources in the environment are limited. 
D)  Each individual depresses population growth equally. 
E)  There is a substantial time lag between gathering resources and reproduction.

Question 13

Use the following to answer questions:
Suppose that of 300 mice in a mice colony born in January, 150 are still alive at the start of September, and 120 are still alive at the start of October.
-What is the mortality rate during the month of September?

Accepted Answer

A)  0.15 
B)  0.20 
C)  0.30 
D)  0.50 
E)  0.80 
A)  0.15 
B)  0.20 
C)  0.30 
D)  0.50 
E)  0.80

Question 14

Which of the following statements about the biotic potential of a population is true?

Accepted Answer

A)  It is equal to the product of the intrinsic rate of population growth times the carrying capacity. 
B)  It is equal to the product of the intrinsic rate of population growth times the population size. 
C)  Populations can grow at rates close to their biotic potential essentially indefinitely. 
D)  Both a and c 
E)  Both b and c 
A)  It is equal to the product of the intrinsic rate of population growth times the carrying capacity. 
B)  It is equal to the product of the intrinsic rate of population growth times the population size. 
C)  Populations can grow at rates close to their biotic potential essentially indefinitely. 
D)  Both a and c 
E)  Both b and c

Question 15

Which of the following tends to be associated with the ability of a species to attain high population densities?

Accepted Answer

A)  Small body size 
B)  Utilization of abundant resources 
C)  Complex social organization 
D)  Recent introduction into a new region 
E)  All of the above 
A)  Small body size 
B)  Utilization of abundant resources 
C)  Complex social organization 
D)  Recent introduction into a new region 
E)  All of the above

Question 16

Suppose that of 210 swan eggs that hatch in a population, 60 survive until the first year, and 36 survive to the next. The mortality rate between the first and second years is _______.

Accepted Answer

The answer of Suppose that of 210 swan eggs that...

Question 17

A population whose size levels off at its carrying capacity is exhibiting

Accepted Answer

A)  exponential growth. 
B)  geometric growth. 
C)  logistic growth. 
D)  J-shaped growth. 
E)  negative growth. 
A)  exponential growth. 
B)  geometric growth. 
C)  logistic growth. 
D)  J-shaped growth. 
E)  negative growth.

Question 18

Zebra mussels, which do not reach high densities in Europe, are a major pest in North America because they are

Accepted Answer

A)  native to North America. 
B)  less subject to predation and pathogens in North America than in Europe. 
C)  not a food delicacy, as they are in Europe. 
D)  All of the above 
E)  None of the above 
A)  native to North America. 
B)  less subject to predation and pathogens in North America than in Europe. 
C)  not a food delicacy, as they are in Europe. 
D)  All of the above 
E)  None of the above

Question 19

Which of the following factors would be most conducive to conducting a full census of a population?

Accepted Answer

A)  Small body size of the individuals in the population 
B)  Relatively stationary individuals 
C)  A large population 
D)  Both a and b 
E)  None of the above 
A)  Small body size of the individuals in the population 
B)  Relatively stationary individuals 
C)  A large population 
D)  Both a and b 
E)  None of the above

Question 20

Which of the following factors would make it more likely that an animal species could survive despite being harvested at a high rate?

Accepted Answer

A)  A low reproductive capacity 
B)  Density-dependent growth rates of individuals 
C)  A long maturation period for individuals of the species 
D)  All of above 
E)  None of the above 
A)  A low reproductive capacity 
B)  Density-dependent growth rates of individuals 
C)  A long maturation period for individuals of the species 
D)  All of above 
E)  None of the above

Exam 55: Population Ecology

A group of individuals born at the same time is known as a

How do the demographic traits of fish and whales influence how these marine resources respond to overexploitation?

Which of the following statements about the intrinsic rate of increase is false?

If the birth rate is 0.05 and the death rate is 0.02, the intrinsic rate of increase (assuming that there is no immigration or emigration)

Use the following to answer questions: Suppose that of 300 mice in a mice colony born in January, 150 are still alive at the start of September, and 120 are still alive at the start of October. -What is the survivorship up to the start of September?

Use the following to answer questions : Refer to the graph below. -At which point in the graph would there be zero population growth (dN/dt = 0)?

When a single bacterium is placed in a culture vessel, the resulting population at first grows very quickly; however, as the population expands and uses up its resources, the growth rate eventually slows down and stops. This growth pattern is best modeled mathematically as _______ growth.

Which of the following attributes tends to promote stability in population numbers?

The logistic growth equation describes a population that

Intensive fishing of the rockfish led to the evolution of _______ fish because _______ fish were selectively caught.

Which of the following is not an assumption of the logistic growth equation?

Use the following to answer questions: Suppose that of 300 mice in a mice colony born in January, 150 are still alive at the start of September, and 120 are still alive at the start of October. -What is the mortality rate during the month of September?

Which of the following statements about the biotic potential of a population is true?

Which of the following tends to be associated with the ability of a species to attain high population densities?

Suppose that of 210 swan eggs that hatch in a population, 60 survive until the first year, and 36 survive to the next. The mortality rate between the first and second years is _______.

A population whose size levels off at its carrying capacity is exhibiting

Zebra mussels, which do not reach high densities in Europe, are a major pest in North America because they are

Which of the following factors would be most conducive to conducting a full census of a population?

Which of the following factors would make it more likely that an animal species could survive despite being harvested at a high rate?

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Signaling and Communication

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

Filters

Intensive fishing of the rockfish led to the evolution of _ fish because _ fish were selectively caught.