Question 1

The size of a population can be decreased by

Accepted Answer

A)   a higher birth rate.
B)   immigration.
C)   emigration.
D)   a reduced death rate.E) A) and D)
F) A) and C)

Question 2

Is a death rate increase from influenza an example of a density-dependent population change or a density-independent population change?

Accepted Answer

Influenza is a disease and,lik...

Question 3

Why do logistic growth curves have an "S" shape?

Accepted Answer

A logistic growth curve shows a steep in...

Question 4

Population size ________ when the combination of death and emigration rates is lower than the combination of birth and immigration rates.

Accepted Answer

The answer of Population size ________ when the combination of...

Question 5

Match each term to a statement listed below.
-total number of individuals in a population within a given area

Accepted Answer

A)  population size
B)  population density
C)  carrying capacity
D)  logistic growth
E)  exponential growthF) A) and B)
G) A) and C)

Question 6

The effects of pollution are generally considered to be density-independent because

Accepted Answer

A)   the contamination level of any organism is unaffected by variations in population density.
B)   when food supplies become limited, the organisms are more likely to consume contaminated foods.
C)   at high densities, the organisms are more likely to contact the pollutant.
D)   when the organisms are stressed by overcrowding, the pollutant becomes more toxic.E) None of the above
F) B) and D)

Question 7

When an isolated population reaches its carrying capacity,

Accepted Answer

A)   the birth rate > the death rate.
B)   the birth rate = the death rate.
C)   the birth rate 
D)   It is not possible to generalize these values.E) B) and D)
F) C) and D)

Question 8

Density-dependent factors are more likely to limit population growth when

Accepted Answer

A)   there are more individuals living in the same amount of space.
B)   the population moves into a larger habitat.
C)   food is abundant.
D)   weather conditions become milder.E) None of the above
F) A) and D)

Question 9

In 1978,a drought on the Galapagos Islands caused a reduction in the production of seeds upon which one of Darwin's finches,a kind of bird,fed.This caused a decrease from 1,400 to 200 birds.This population change factor

Accepted Answer

A)   would not be considered a part of the carrying capacity for these birds.
B)   was density-dependent.
C)   was density-independent.
D)   resulted in exponential growth for the bird population.E) A) and B)
F) All of the above

Question 10

Determine which examples are density-dependent population changes and which are density-independent population changes.
-A wildfire sweeps through a forest and kills 90 percent of the oak trees.

Accepted Answer

A)  density-dependent population change
B)  density-independent population changeC) A) and B)
D) undefined

Question 11

A population change in which the populations of two species rise and fall together in a predictable pattern is called a(n)________.

Accepted Answer

cyclical f...

Question 12

Which of the following statements about carrying capacity is true?

Accepted Answer

A)   An S-shaped curve represents a population's ability to increase its numbers above the carrying capacity of its habitat.
B)   J-shaped curves show the immediate limiting effect of carrying capacity on a newly introduced organism.
C)   The carrying capacity is the same for all organisms in the same area.
D)   The carrying capacity is established by the resource with the most limited availability.E) B) and C)
F) A) and B)

Question 13

Studies of the population-size cycles seen between the snowshoe hare and the Canadian lynx showed that lynx populations ________ in size when hare populations ________ in size.

Accepted Answer

A)   decrease; increase
B)   increase; decrease
C)   decrease; decrease
D)   There is no relationship between population sizes of snowshoe hare and Canadian lynx.E) None of the above
F) A) and D)

Question 14

What causes an S-shaped growth curve to flatten out at the top?

Accepted Answer

The flattening at the top of a...

Question 15

A J-shaped population growth pattern indicates that a population is

Accepted Answer

A)   utilizing all resources in an area and birth rates are equal to death rates.
B)   growing at its maximum rate and birth rates are higher than death rates.
C)   unaffected by diseases and birth rates are equal to death rates.
D)   closely linked to prey, which are available in unlimited supply, and the birth rates are higher than death rates.E) B) and D)
F) C) and D)

Question 16

The maximum population size that can be supported by its habitat is known as

Accepted Answer

A)   maximum increase.
B)   carrying capacity.
C)   exponential growth.
D)   population balance.E) A) and B)
F) B) and D)

Question 17

In the figure below,the willow tree population leveled off at 475 trees and remained stable in the early 1980s.This most likely occurred because the

Accepted Answer

A)   trees occupied all of the available space that willows were able to occupy.
B)   tree seedlings were shaded by the grasses shown in the illustration.
C)   population growth rate exceeded the death rate.
D)   trees depleted all of the nutrients in the soil and the trees could no longer grow.E) All of the above
F) B) and D)

Question 18

Use a specific example to explain how population density may change for people living in one country without any change in population size.

Accepted Answer

Population density is the number of indi...

Question 19

A population of 10 yeast cells is put into a flask with growth media that contains all the nutrients required for growth.The yeast has a doubling time of 2 hours; 4 hours after adding the yeast to the flask the population size is 40 cells.After 3 days the population size stabilizes at around 500 cells.Is this population exhibiting logistic or exponential growth? Explain your reasoning.

Accepted Answer

This population exhibits logistic growth...

Question 20

When comparing the peaks on both of the graphs below the lynx population reaches its maximum

Accepted Answer

A)   slightly after the hare population reaches its maximum.
B)   slightly before the hare population reaches its maximum.
C)   at the same time that the hare population reaches its maximum.
D)   at random intervals that do not appear linked to hare populations.E) None of the above
F) All of the above

Exam 19: Growth of Populations

A J-shaped population growth pattern indicates that a population is

Correct Answer
verified

In the figure below,the willow tree population leveled off at 475 trees and remained stable in the early 1980s.This most likely occurred because the

Correct Answer
verified

What causes an S-shaped growth curve to flatten out at the top?

Correct Answer
verified
The flattening at the top of a...
View Answer

Which of the following statements about carrying capacity is true?

Correct Answer
verified

When comparing the peaks on both of the graphs below the lynx population reaches its maximum

Correct Answer
verified

When an isolated population reaches its carrying capacity,

Correct Answer
verified

Is a death rate increase from influenza an example of a density-dependent population change or a density-independent population change?

Correct Answer
verified
Influenza is a disease and,lik...
View Answer

Population size ________ when the combination of death and emigration rates is lower than the combination of birth and immigration rates.

Correct Answer
verified

Determine which examples are density-dependent population changes and which are density-independent population changes. -A wildfire sweeps through a forest and kills 90 percent of the oak trees.

Correct Answer
verified

Studies of the population-size cycles seen between the snowshoe hare and the Canadian lynx showed that lynx populations in size when hare populations in size.

Correct Answer
verified

Correct Answer
verified
This population exhibits logistic growth...
View Answer

Why do logistic growth curves have an "S" shape?

Correct Answer
verified
A logistic growth curve shows a steep in...
View Answer

Density-dependent factors are more likely to limit population growth when

Correct Answer
verified

The maximum population size that can be supported by its habitat is known as

Correct Answer
verified

In 1978,a drought on the Galapagos Islands caused a reduction in the production of seeds upon which one of Darwin's finches,a kind of bird,fed.This caused a decrease from 1,400 to 200 birds.This population change factor

Correct Answer
verified

A population change in which the populations of two species rise and fall together in a predictable pattern is called a(n)________.

Correct Answer
verified
cyclical f...
View Answer

Use a specific example to explain how population density may change for people living in one country without any change in population size.

Correct Answer
verified
Population density is the number of indi...
View Answer

Match each term to a statement listed below. -total number of individuals in a population within a given area

Correct Answer
verified

The size of a population can be decreased by

Correct Answer
verified

The effects of pollution are generally considered to be density-independent because

Correct Answer
verified

Exam 19: Growth of Populations

A J-shaped population growth pattern indicates that a population is

Correct AnswerverifiedShow Answer

In the figure below,the willow tree population leveled off at 475 trees and remained stable in the early 1980s.This most likely occurred because the

Correct AnswerverifiedShow Answer

What causes an S-shaped growth curve to flatten out at the top?

Correct AnswerverifiedThe flattening at the top of a...View AnswerShow Answer

Which of the following statements about carrying capacity is true?

Correct AnswerverifiedShow Answer

When comparing the peaks on both of the graphs below the lynx population reaches its maximum

Correct AnswerverifiedShow Answer

When an isolated population reaches its carrying capacity,

Correct AnswerverifiedShow Answer

Is a death rate increase from influenza an example of a density-dependent population change or a density-independent population change?

Correct AnswerverifiedInfluenza is a disease and,lik...View AnswerShow Answer

Population size ________ when the combination of death and emigration rates is lower than the combination of birth and immigration rates.

Correct AnswerverifiedShow Answer

Determine which examples are density-dependent population changes and which are density-independent population changes. -A wildfire sweeps through a forest and kills 90 percent of the oak trees.

Correct AnswerverifiedShow Answer

Studies of the population-size cycles seen between the snowshoe hare and the Canadian lynx showed that lynx populations ________ in size when hare populations ________ in size.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThis population exhibits logistic growth...View AnswerShow Answer

Why do logistic growth curves have an "S" shape?

Correct AnswerverifiedA logistic growth curve shows a steep in...View AnswerShow Answer

Density-dependent factors are more likely to limit population growth when

Correct AnswerverifiedShow Answer

The maximum population size that can be supported by its habitat is known as

Correct AnswerverifiedShow Answer

In 1978,a drought on the Galapagos Islands caused a reduction in the production of seeds upon which one of Darwin's finches,a kind of bird,fed.This caused a decrease from 1,400 to 200 birds.This population change factor

Correct AnswerverifiedShow Answer

A population change in which the populations of two species rise and fall together in a predictable pattern is called a(n)________.

Correct Answerverifiedcyclical f...View AnswerShow Answer

Use a specific example to explain how population density may change for people living in one country without any change in population size.

Correct AnswerverifiedPopulation density is the number of indi...View AnswerShow Answer

Match each term to a statement listed below. -total number of individuals in a population within a given area

Correct AnswerverifiedShow Answer

The size of a population can be decreased by

Correct AnswerverifiedShow Answer

The effects of pollution are generally considered to be density-independent because

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The flattening at the top of a...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Influenza is a disease and,lik...
View Answer

Correct Answer
verified

Correct Answer
verified

Studies of the population-size cycles seen between the snowshoe hare and the Canadian lynx showed that lynx populations in size when hare populations in size.

Correct Answer
verified

Correct Answer
verified
This population exhibits logistic growth...
View Answer

Correct Answer
verified
A logistic growth curve shows a steep in...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
cyclical f...
View Answer

Correct Answer
verified
Population density is the number of indi...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified