Question 1

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 2

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 change 
A) density-dependent population change 
B) density-independent population change

Question 3

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. 
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.

Question 4

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. 
A)  decrease; increase 
B)  increase; decrease 
C)  decrease; decrease 
D)  There is no relationship between population sizes of snowshoe hare and Canadian lynx.

Question 5

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. 
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.

Question 6

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 7

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

Question 8

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 9

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. 
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.

Question 10

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. 
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.

Question 11

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 12

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

Question 13

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. 
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.

Question 14

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

Question 15

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 16

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. 
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.

Question 17

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

Accepted Answer

The flattening at the top of a

Question 18

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

Question 19

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

Accepted Answer

A logistic growth curve shows a steep in

Question 20

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. 
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.

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

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.

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

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.

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

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

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

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

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

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

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

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

When an isolated population reaches its carrying capacity,

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

Which of the following statements about carrying capacity is true?

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

The size of a population can be decreased by

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

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

The Nature of Science

Evaluating Scientific Claims

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Bacteria and Archaea

Plants, Fungi, and Protists

Animals and Human Evolution

General Principles of Ecology

Communities of Organisms

Ecosystems

Filters

Exam 19: Growth of Populations

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

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.

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

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.

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

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

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

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

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

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

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

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

When an isolated population reaches its carrying capacity,

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

Which of the following statements about carrying capacity is true?

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

The size of a population can be decreased by

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

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

The Nature of Science

Evaluating Scientific Claims

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Bacteria and Archaea

Plants, Fungi, and Protists

Animals and Human Evolution

General Principles of Ecology

Communities of Organisms

Ecosystems

Filters

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.