Question 1

Some predators feed primarily on the most abundant prey. This is an example of predation.

Accepted Answer

A)  density- independent 
B)  competitive 
C)  cyclical 
D)  density- dependent 
E)  exponential 
A)  density- independent 
B)  competitive 
C)  cyclical 
D)  density- dependent 
E)  exponential

Question 2

What might cause a uniform population distribution?

Accepted Answer

A)  The need to find a mate 
B)  Competition for resources 
C)  Scarce resources 
D)  The need to hunt in a group 
E)  The need for a group to care for its offspring 
A)  The need to find a mate 
B)  Competition for resources 
C)  Scarce resources 
D)  The need to hunt in a group 
E)  The need for a group to care for its offspring

Question 3

Explain what happens in exponential population growth.

Accepted Answer

The population grows by a fixe

Question 4

Environmental resistance may limit the size of populations by

Accepted Answer

A)  decreasing death rates and/or increasing birth rates. 
B)  increasing both birth and death rates. 
C)  decreasing both birth and death rates. 
D)  changing the biotic potential. 
E)  increasing death rates and/or decreasing birth rates. 
A)  decreasing death rates and/or increasing birth rates. 
B)  increasing both birth and death rates. 
C)  decreasing both birth and death rates. 
D)  changing the biotic potential. 
E)  increasing death rates and/or decreasing birth rates.

Question 5

Purple loosestrife, a European plant, was introduced into the American Great Lakes region where it has no natural predators. Each plant produces thousands of seeds annually, and it now clogs acres of wetlands, crowding out native plants. Purple loosestrife is considered a(n)

Accepted Answer

A)  density- independent species. 
B)  predator. 
C)  density- dependent species. 
D)  invasive species. 
E)  replacement- level fertility species. 
A)  density- independent species. 
B)  predator. 
C)  density- dependent species. 
D)  invasive species. 
E)  replacement- level fertility species.

Question 6

Exponential growth occurs when

Accepted Answer

A)  environmental resistance declines each year. 
B)  the number of births each year is constant and the birth rate is higher than the death rate. 
C)  the population grows by a fixed percentage of its size each year. 
D)  the rate of emigration is higher than the rate of immigration. 
E)  the biotic potential decreases each year. 
A)  environmental resistance declines each year. 
B)  the number of births each year is constant and the birth rate is higher than the death rate. 
C)  the population grows by a fixed percentage of its size each year. 
D)  the rate of emigration is higher than the rate of immigration. 
E)  the biotic potential decreases each year.

Question 7

Which species has the highest biotic potential?

Accepted Answer

A)  An elephant that produces a single calf every 3 years 
B)  A lioness that produces three cubs once a year 
C)  A fungus that produces thousands of reproductive spores every day 
D)  A rat that produces a litter of six pups every 3 months 
E)  A bacteria that divides only once every 3 weeks 
A)  An elephant that produces a single calf every 3 years 
B)  A lioness that produces three cubs once a year 
C)  A fungus that produces thousands of reproductive spores every day 
D)  A rat that produces a litter of six pups every 3 months 
E)  A bacteria that divides only once every 3 weeks

Question 8

A population that initially grows rapidly, then slows, and eventually stabilizes close to the carrying capacity of the environment exhibits _ population growth.

Accepted Answer

logistic (

Question 9

Which tends to be more intense: intraspecific or interspecific competition? Why?

Accepted Answer

Intraspecific competition tend

Question 10

How do interspecific and intraspecific competition differ?

Accepted Answer

Interspecific competition occu

Question 11

When parents, on average, have just the number of children required to replace themselves, the natural increase of their population is at replacement level fertility (RLF).

Accepted Answer

A) True 
 B)False

Question 12

Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year. The factors that keep natural populations from increasing are collectively called

Accepted Answer

A)  exponential growth. 
B)  nonliving factors. 
C)  environmental resistance. 
D)  scramble competition. 
E)  biotic potential. 
A)  exponential growth. 
B)  nonliving factors. 
C)  environmental resistance. 
D)  scramble competition. 
E)  biotic potential.

Question 13

What factors determine the natural increase of a population?

Accepted Answer

The growth rate is b

Question 14

In a deciduous oak forest in the northeastern United States, one example of a nonliving component of the ecosystem is

Accepted Answer

A)  the smaller plants living under the oak trees. 
B)  nematodes in the soil that feed on dead organic matter. 
C)  animals such as deer that migrate through the forest but do not eat in the forest. 
D)  nematodes in the soil that feed on plant roots. 
E)  sunlight that filters through the canopy. 
A)  the smaller plants living under the oak trees. 
B)  nematodes in the soil that feed on dead organic matter. 
C)  animals such as deer that migrate through the forest but do not eat in the forest. 
D)  nematodes in the soil that feed on plant roots. 
E)  sunlight that filters through the canopy.

Question 15

Which factor does NOT influence the size a population reaches through natural increase?

Accepted Answer

A)  Distance traveled by migrants 
B)  Number of births 
C)  Age of females at reproduction 
D)  Number of deaths 
E)  Frequency of reproduction 
A)  Distance traveled by migrants 
B)  Number of births 
C)  Age of females at reproduction 
D)  Number of deaths 
E)  Frequency of reproduction

Question 16

Interspecific competition is a density- independent factor.

Accepted Answer

A) True 
 B)False

Question 17

In countries that have large numbers of children under age 15, the population is

Accepted Answer

A)  becoming larger. 
B)  becoming smaller. 
C)  staying the same. 
D)  able to expand its carrying capacity. 
E)  hard to predict. 
A)  becoming larger. 
B)  becoming smaller. 
C)  staying the same. 
D)  able to expand its carrying capacity. 
E)  hard to predict.

Question 18

The collective human ecological footprint is now much larger than Earth's sustainable resource base.

Accepted Answer

A) True 
 B)False

Question 19

If adults of reproductive age are having just enough children to replace themselves, then the population is said to have fertility.

Accepted Answer

The answer of If adults of reproductive age are having...

Question 20

At present, Earth's human population is

Accepted Answer

A)  increasing exponentially. 
B)  stable. 
C)  increasing at a constant rate. 
D)  declining. 
E)  increasing by about 10% per year. 
A)  increasing exponentially. 
B)  stable. 
C)  increasing at a constant rate. 
D)  declining. 
E)  increasing by about 10% per year.

Exam 27: Population Growth and Regulation

Some predators feed primarily on the most abundant prey. This is an example of predation.

What might cause a uniform population distribution?

Explain what happens in exponential population growth.

Environmental resistance may limit the size of populations by

Purple loosestrife, a European plant, was introduced into the American Great Lakes region where it has no natural predators. Each plant produces thousands of seeds annually, and it now clogs acres of wetlands, crowding out native plants. Purple loosestrife is considered a(n)

Exponential growth occurs when

Which species has the highest biotic potential?

A population that initially grows rapidly, then slows, and eventually stabilizes close to the carrying capacity of the environment exhibits _ population growth.

Which tends to be more intense: intraspecific or interspecific competition? Why?

How do interspecific and intraspecific competition differ?

When parents, on average, have just the number of children required to replace themselves, the natural increase of their population is at replacement level fertility (RLF).

What factors determine the natural increase of a population?

In a deciduous oak forest in the northeastern United States, one example of a nonliving component of the ecosystem is

Which factor does NOT influence the size a population reaches through natural increase?

Interspecific competition is a density- independent factor.

In countries that have large numbers of children under age 15, the population is

The collective human ecological footprint is now much larger than Earth's sustainable resource base.

If adults of reproductive age are having just enough children to replace themselves, then the population is said to have fertility.

At present, Earth's human population is

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

Filters