1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which of the following is NOT one of the factors that play a role in population growth

rate?1. immigration

2. death rate

3. emigration

4. demography

1 2 3 4

25% 25%25%25%

1 2 3 4 5

One of the main characteristics of a population is its

1. change over time.

2. geographic distribution.

3. dynamics.

4. habitat.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Sea otters are important to the populations of

1. kelp.

2. sea urchins.

3. killer whales.

4. all of the above

1 2 3 4

25% 25%25%25%

1 2 3 4 5

There are 150 Saguaro cactus plants per square kilometer in a certain area of Arizona desert. To which population

characteristic does this information refer?

1. growth rate

2. geographic distribution

3. age structure

4. population density

1 2 3 4

25% 25%25%25%

1 2 3 4 5

What does the range of a population tell you that density does not?

1. the number that live in an area

2. the areas inhabited by a population

3. the births per unit area

4. the deaths per unit area

1 2 3 4

25% 25%25%25%

1 2 3 4 5

A small farming community in Texas covers 14 square kilometers. There are 420 individuals who live within the

town limits. What is the population density of this community?

1. 0.03 individuals per square kilometer

2. 53 individuals per square kilometer

3. 30 individuals per square kilometer

4. 10.24 individuals per square kilometer

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which of the following tells you population density?

1. the number of births per year

2. the number of frogs in a pond

3. the number of deaths per year

4. the number of bacteria per square millimeter

1 2 3 4

25% 25%25%25%

1 2 3 4 5

The movement of organisms into a given area from another area is called

1. immigration.

2. emigration.

3. population shift.

4. carrying capacity.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

When organisms move out of the population, this is known as

1. emigration.

2. abandonment.

3. immigration.

4. succession.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

What must occur in a population for it to grow?

1. The birthrate becomes higher than the death rate.

2. The birthrate stays the same and the death rate increases.

3. The birthrate becomes lower than the death rate.

4. The birthrate and the death rate remain the same.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

What is happening in a population as it decreases?

1. The birthrate and the death rate remain the same.

2. The death rate becomes lower than the birthrate.

3. The death rate stays the same and the birthrate increases.

4. The death rate becomes higher than the birthrate.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

If immigration and emigration numbers remain equal, which is the most important

contributing factor to a slowed growth rate?1. increased

birthrate

2. constant death rate

3. decreased birthrate

4. constant birthrate

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which are two ways a population can decrease in size?

1. immigration and emigration

2. increased death rate and immigration

3. decreased birthrate and emigration

4. emigration and increased birthrate

1 2 3 4

25% 25%25%25%

1 2 3 4 5

When individuals in a population reproduce at a constant rate, it is called

1. logistic growth.

2. growth density.

3. exponential growth.

4. multiple growth.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

The various growth phases through which most populations go are represented on

a(an)1. logistic growth

curve.

2. exponential growth curve.

3. normal curve.

4. population curve.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

As resources in a population become less available, the population

1. declines rapidly.

2. increases slowly.

3. reaches carrying capacity.

4. enters a phase of exponential growth.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which factor might NOT contribute to an exponential growth rate in a given

population?1. lower death rates

2. higher birthrates

3. less competition

4. reduced resources

1 2 3 4

25% 25%25%25%

1 2 3 4 5

In a logistic growth curve, exponential growth is the phase in which the population

1. reaches carrying capacity.

2. grows quickly.

3. growth begins to slow down.

4. growth stops.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

When the exponential phase of a logistic growth curve of a population ceases,

1. the size of the population drops.

2. the size of the population stays the same.

3. population growth begins to slow down.

4. population growth begins to speed up.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

A biotic or an abiotic resource in the environment that causes population size to

decrease is a1. carrying capacity.

2. limiting nutrient.

3. limiting factor.

4. growth factor.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

All of the following are limiting factors EXCEPT

1. immigration.

2. competition.

3. predation.

4. human disturbances.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which of the following is NOT likely to be a limiting factor on the sea otter population?

1. disease

2. competition

3. drought

4. predation

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which will reduce competition within a species’ population?

1. fewer individuals

2. higher birthrate

3. fewer resources

4. higher population density

1 2 3 4

25% 25%25%25%

1 2 3 4 5

If a population grows larger than the carrying capacity of the environment, the

1. death rate may rise.

2. birthrate may rise.

3. death rate must fall.

4. birthrate must fall.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Water lilies do not grow in desert sand because water availability to these plants in

a desert is1. a limiting factor.

2. the carrying capacity.

3. a competition factor.

4. none of the above

1 2 3 4

25% 25%25%25%

1 2 3 4 5

A limiting nutrient is to ecosystem productivity as a limiting factor is to

population1. birthrate.

2. density.

3. growth rate.

4. immigration.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Each of the following is a density-dependent limiting factor EXCEPT

1. competition.

2. seasonal cycles.

3. crowding.

4. disease.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which would be least likely to be affected by a density-dependent limiting factor?

1. a small, scattered population

2. a population with a high birthrate

3. a large, dense population

4. a population with a high immigration rate

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which of the following is a density-independent limiting factor?

1. earthquake

2. disease

3. emigration

4. parasitism

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which density-dependent factors other than the predator/prey relationship affected the populations

of moose and wolves on Isle Royale?

1. extreme temperatures for the moose and flooding for the wolves

2. parasitic wasps for the wolves and clear-cut forest for the moose

3. a hurricane followed by drought for both moose and wolves

4. food availability for the moose and disease for the wolf

1 2 3 4

25% 25%25%25%

1 2 3 4 5

A disease resulting in the deaths of one third of a dense population of bats in a cave

would be a1. density-dependent

limiting factor.

2. result of exponential growth.

3. density-independent limiting factor.

4. nutrient-limiting factor.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which of the following would NOT be a limiting factor to the size of a large, dense

population?1. a struggle for food, water,

space, or sunlight

2. predator/prey relationships

3. a struggle to find shelter from a natural disaster

4. parasitism and disease

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Human population growth has slowed down in

1. China.

2. the United States.

3. India.

4. Africa.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Demography is the scientific study of

1. parasitism and disease.

2. modernized countries.

3. human populations.

4. none of the above

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Demographic transition is change from high birthrates and high death rates to

1. exponential growth.

2. a low birthrate and a low death rate.

3. a low birthrate and a high death rate.

4. indefinite growth.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

About 500 years ago, the world’s population started

1. decreasing.

2. to reach carrying capacity.

3. growing more rapidly.

4. to level off.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Countries in the first stage of demographic transition have

1. a low death rate and a high birthrate.

2. a high death rate and a low birthrate.

3. a slowly growing population.

4. more old people than young people.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Demographic transition begins with changes in society that

1. lower the birthrate.

2. increase the birthrate.

3. lower the death rate.

4. increase the death rate.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

The human population experienced exponential growth after

1. agriculture began.

2. plowing and irrigation began.

3. the bubonic plague began.

4. the Industrial Revolution began.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Which country has not yet completed the demographic transition?

1. United States

2. India

3. Great Britain

4. Japan

1 2 3 4

25% 25%25%25%

1 2 3 4 5

The anticipated human population by the year 2050 is about

1. 7.8 billion.

2. 9 billion.

3. 9 trillion.

4. 78 billion.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

In Rwanda, there are more young children than teenagers, and more teenagers than adults. This

age structure indicates a population that

1. has stopped growing.

2. will double in 30 years.

3. has a steady growth rate.

4. will decrease in 30 years.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

In countries like India, the human population is growing

1. exponentially.

2. transitionally.

3. logistically.

4. demographically.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

Most of the worldwide human population is growing exponentially because

1. human populations have not reached their exponential curve.

2. human populations have not yet completed the demographic transition.

3. human populations do not conform to the logistic model.

4. science and technology have made it possible.

1 2 3 4

25% 25%25%25%

1 2 3 4 5

How can a diagram of a population’s age structure predict how it can grow?

1. It shows how many people are at reproductive ages.

2. It shows how many people will probably die within a few years.

3. It shows how many people are entering the population by birth.

4. all of the above

1 2

50%50%

1 2 3 4 5

The number of individuals per unit area is a population’s growth rate.

_________________________1. True

2. False

1 2

50%50%

1 2 3 4 5

If the death rate of a population is greater than the birthrate, the population shrinks.

_________________________1. True

2. False

1 2

50%50%

1 2 3 4 5

There are about four million births per year in the United States. This statistic is a population dynamic called growth

rate. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

Logistic growth occurs when a population’s growth slows or stops, following a period of rapid growth.

_________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

Under conditions of logistic growth, population size will rise and fall around an average point called the carrying capacity. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

The exponential model of population growth accounts for the influence of carrying

capacity. _________________________1. True

2. False

1 2

50%50%

1 2 3 4 5

One of the best-known mechanisms of population control is the parasite-host

relationship. _________________________1. True

2. False

1 2

50%50%

1 2 3 4 5

Predators can limit the size of populations by weakening their hosts, resulting in disease or

death. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

Human activities, such as damming rivers, are density-independent limiting factors.

_________________________1. True

2. False

1 2

50%50%

1 2 3 4 5

Density-dependent limiting factors affect all populations, whether the population size is two or

a hundred. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

Resource shortages triggered by increasing population size are density-independent limiting

factors. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

The size of the human population tends to increase with time.

_________________________1. True

2. False

1 2

50%50%

1 2 3 4 5

The human population grew slowly from the beginning of human existence, and then began to grow exponentially

about 200 years ago. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

The population of a country whose age structure has many more children than people over 40 years of age will

probably decrease rapidly in the future. _________________________

1. True

2. False

1 2

50%50%

1 2 3 4 5

An indication that a country has completed the demographic transition is a low birthrate and a low

death rate. _________________________

1. True

2. False

Participant Scores

0 Participant 1

0 Participant 2

0 Participant 3

0 Participant 4

0 Participant 5

0 of 51 2 3 4 5

A population can be characterized by its geographic distribution, density, growth rate,

and _________________________.

0 of 51 2 3 4 5

Emigration can cause a population to ____________________ in size.

0 of 51 2 3 4 5

When an individual moves into one population from a different population, it is

called ____________________.

0 of 51 2 3 4 5

Under ideal conditions with unlimited resources, a population will grow

____________________.

0 of 51 2 3 4 5

Zero population growth is a characteristic of ____________________ population growth.

0 of 51 2 3 4 5

A population of bacteria with a limited supply of nutrients will eventually show growth typical of the

____________________ model.

0 of 51 2 3 4 5

If an entire wolf population dies, the moose population on which it preys will grow to the

environment’s ____________________.

0 of 51 2 3 4 5

Competition, predation, parasitism, and ____________________ are density-

dependent limiting factors.

0 of 51 2 3 4 5

Density-dependent ____________________ factors in natural populations help keep

them from increasing indefinitely.

0 of 51 2 3 4 5

The rise-and-fall cycle of a predator-prey relationship is a density-

____________________ relationship.

0 of 51 2 3 4 5

A diagram that illustrates how many people of different ages and gender are presently living in a country is called

a(an) ______________________________.

0 of 51 2 3 4 5

The change in growth rate that results from the change in birthrates and death rates is known as a

______________________________.

0 of 51 2 3 4 5

During early human history, the growth rate was low because the birthrate was high and the death

rate was ____________________.

0 of 51 2 3 4 5

Social and ____________________ factors explain why some countries have high growth rates, whereas other

countries grow slowly or not at all.

0 of 51 2 3 4 5

The exponential growth rate of some countries indicates that these countries have not yet fully

____________________ socially and economically.

0 of 51 2 3 4 5

What are four main characteristics of a population?

0 of 51 2 3 4 5

How does emigration affect population size?

0 of 51 2 3 4 5

If a population of pine trees is 25 trees in 5 square kilometers and another population is 25 trees in 2 square

kilometers, which population has the higher density? Why?

0 of 51 2 3 4 5

Why must wildlife biologists consider immigration and emigration when studying

certain animals?

0 of 51 2 3 4 5

Describe the graph of exponential growth.

0 of 51 2 3 4 5

Describe the period of growth on a logistic growth curve just before carrying capacity is

reached.

0 of 51 2 3 4 5

What is a limiting factor? Give two or three examples

0 of 51 2 3 4 5

What is a density-independent limiting factor? Give two or three examples

0 of 51 2 3 4 5

What are some factors that keep a population from growing further once it reaches the carrying

capacity of its environment?

0 of 51 2 3 4 5

Why did the human population begin growing exponentially about 500 years ago?

0 of 51 2 3 4 5

What kept the human growth rate low before the Industrial Revolution?

0 of 51 2 3 4 5

How can a demographer, or scientist who studies demography, predict how a population will change in the future?

0 of 51 2 3 4 5

What are some of the factors that economists believe will overcome the negative impacts of the

growth of the human population?

0 of 51 2 3 4 5

How does population growth in the United States compare with that in China and

India?

0 of 51 2 3 4 5

What evidence is there that Japan has completed the demographic transition?

0 of 51 2 3 4 5

How can different population sizes affect density in areas of the same size? Give an

example

0 of 51 2 3 4 5

Discuss four ways population sizes can change.

0 of 51 2 3 4 5

Differentiate between exponential and logistic growth.

0 of 51 2 3 4 5

Explain the limiting factors that control population growth.

0 of 51 2 3 4 5

Explain how predator and prey populations limit each other’s growth rates.

0 of 51 2 3 4 5

Differentiate between density-dependent and density-independent limiting factors.

0 of 51 2 3 4 5

Competition can be a major force behind evolutionary change. How does this competition

relate to density-dependent competition?

0 of 51 2 3 4 5

Sequence the historical events that contributed to the current human population

growth.

0 of 51 2 3 4 5

Compare some ecologists’ view of world population growth with that of some

economists.

0 of 51 2 3 4 5

What is the future of worldwide population growth?