UA BSC Exam Study Guide 2025/2026 Edition – Study Smart with
100% Correct Answers! Graded A+
The definition of a density-dependent factor is __________.
a population-limiting factor whose intensity is unrelated to population density
a dramatic fluctuation in density with remarkable regularity
competition between individuals of the same species for the same limited resources
a population-limiting factor whose effects intensify as the population increases in density - a
population-limiting factor whose effects intensify as the population increases in density
To figure out the human population density of your community, you would need to know the
number of people living there and __________.
the birth rate of the population
the size of the area in which they live
the carrying capacity
whether population growth is logistic or exponential
the dispersion pattern of the population - The size of the area in which they live
Ecologists represent life table data graphically in a __________ - Survivorship curve
The intentional release of a natural enemy to attack a pest population is called ________ - Biological
control
If you have a population growth curve that shows a decrease in the growth rate as the population
size approaches carrying capacity, you would say that population is exhibiting __________ growth -
Logistic population growth
Type I survivorship curves are typical of species that exhibit ________. - few offspring and good
parental care
During the Pleistocene era, many large mammal species went extinct. Their permanent
disappearance occurred in a short period of time when humans were expanding across North
America. In this situation, how do many scientists view humans? - As an invasive species
,Chinese privet is a plant that is native to China. Over 150 years ago, Chinese privet was introduced to
the United States as a fast-growing shrub that serves as an excellent privacy hedge. With no natural
herbivore, Chinese privet quickly established itself and spread in natural areas throughout the
southeast and eastern seaboard of the United States. Its dominance in these areas has jeopardized
the survival of native plant species. Chinese privet provides evidence that ________. - introducing
non-native organisms can cause environmental damage
Which of these factors operates on populations in a density-dependent manner?
food supply
volcanic eruption
flood
blizzard - Food supply
What will be the approximate shape of the age-structure diagram of a rapidly increasing population?
- A pyramid
What is a characteristic of Type I survivorship curves?
Most individuals survive to older age intervals.
Survivorship is constant over the lifespan.
There is low survivorship for the very young.
Survivorship is high for the few individuals that survive to a certain age - Most individuals survive to
older age intervals.
Competition among individuals of the same species for the same limited resources is ________
competition. - Intraspecific
In an ideal, unlimited environment, a population's growth follows a(n) ________ model. -
Exponential
A population is defined as __________ - a group of individuals of a single species that occupies the
same general area
Species that exhibit an equilibrial life history typically ________.
exhibit a Type III survivorship curve
, exhibit a Type II survivorship curve
have a large number of offspring
have long lives - Have long lives
An unexpected freeze that kills a population of chipmunks is an example of ________. - A density-
independent factor
The single largest current cause of population decline of threatened or endangered species is
__________. - Habitat destruction
Which of the following events could NOT be caused by a population bottleneck?
Increased population size
Loss of alleles
Reduction in genetic variability
Changes in allele frequency - Increased population size
In evolutionary terms, an organism's fitness is measured by its __________. - Contribution of
genetics to the next generation
In 1859 Charles Darwin wrote, "The affinities of all the beings of the same class have sometimes
been represented by a great tree.... As buds give rise by growth to fresh buds, and these if vigorous,
branch out and overtop on all sides many a feebler branch, so by generation I believe it has been
with the great Tree of Life, which fills with its dead and broken branches the crust of the earth, and
covers the surface with its ever branching and beautiful ramifications." At the base of the
evolutionary tree of all life is __________. - an organism that is a common ancestor to all living
organisms
Similarity resulting from common ancestry is known as ________. - Homology
While on his voyage aboard the HMS Beagle, Darwin was strongly influenced by this book. -
Principles of Geology
A significant consequence of gene flow is that it __________. - tends to reduce differences between
populations
100% Correct Answers! Graded A+
The definition of a density-dependent factor is __________.
a population-limiting factor whose intensity is unrelated to population density
a dramatic fluctuation in density with remarkable regularity
competition between individuals of the same species for the same limited resources
a population-limiting factor whose effects intensify as the population increases in density - a
population-limiting factor whose effects intensify as the population increases in density
To figure out the human population density of your community, you would need to know the
number of people living there and __________.
the birth rate of the population
the size of the area in which they live
the carrying capacity
whether population growth is logistic or exponential
the dispersion pattern of the population - The size of the area in which they live
Ecologists represent life table data graphically in a __________ - Survivorship curve
The intentional release of a natural enemy to attack a pest population is called ________ - Biological
control
If you have a population growth curve that shows a decrease in the growth rate as the population
size approaches carrying capacity, you would say that population is exhibiting __________ growth -
Logistic population growth
Type I survivorship curves are typical of species that exhibit ________. - few offspring and good
parental care
During the Pleistocene era, many large mammal species went extinct. Their permanent
disappearance occurred in a short period of time when humans were expanding across North
America. In this situation, how do many scientists view humans? - As an invasive species
,Chinese privet is a plant that is native to China. Over 150 years ago, Chinese privet was introduced to
the United States as a fast-growing shrub that serves as an excellent privacy hedge. With no natural
herbivore, Chinese privet quickly established itself and spread in natural areas throughout the
southeast and eastern seaboard of the United States. Its dominance in these areas has jeopardized
the survival of native plant species. Chinese privet provides evidence that ________. - introducing
non-native organisms can cause environmental damage
Which of these factors operates on populations in a density-dependent manner?
food supply
volcanic eruption
flood
blizzard - Food supply
What will be the approximate shape of the age-structure diagram of a rapidly increasing population?
- A pyramid
What is a characteristic of Type I survivorship curves?
Most individuals survive to older age intervals.
Survivorship is constant over the lifespan.
There is low survivorship for the very young.
Survivorship is high for the few individuals that survive to a certain age - Most individuals survive to
older age intervals.
Competition among individuals of the same species for the same limited resources is ________
competition. - Intraspecific
In an ideal, unlimited environment, a population's growth follows a(n) ________ model. -
Exponential
A population is defined as __________ - a group of individuals of a single species that occupies the
same general area
Species that exhibit an equilibrial life history typically ________.
exhibit a Type III survivorship curve
, exhibit a Type II survivorship curve
have a large number of offspring
have long lives - Have long lives
An unexpected freeze that kills a population of chipmunks is an example of ________. - A density-
independent factor
The single largest current cause of population decline of threatened or endangered species is
__________. - Habitat destruction
Which of the following events could NOT be caused by a population bottleneck?
Increased population size
Loss of alleles
Reduction in genetic variability
Changes in allele frequency - Increased population size
In evolutionary terms, an organism's fitness is measured by its __________. - Contribution of
genetics to the next generation
In 1859 Charles Darwin wrote, "The affinities of all the beings of the same class have sometimes
been represented by a great tree.... As buds give rise by growth to fresh buds, and these if vigorous,
branch out and overtop on all sides many a feebler branch, so by generation I believe it has been
with the great Tree of Life, which fills with its dead and broken branches the crust of the earth, and
covers the surface with its ever branching and beautiful ramifications." At the base of the
evolutionary tree of all life is __________. - an organism that is a common ancestor to all living
organisms
Similarity resulting from common ancestry is known as ________. - Homology
While on his voyage aboard the HMS Beagle, Darwin was strongly influenced by this book. -
Principles of Geology
A significant consequence of gene flow is that it __________. - tends to reduce differences between
populations
