Question 1

Developing countries tend to have a(n)________ age structure diagram.

Accepted Answer

A) rectangular 
B) inverted triangle-shaped 
C) pyramid-shaped 
D) square 
E) round 
A) rectangular 
B) inverted triangle-shaped 
C) pyramid-shaped 
D) square 
E) round

Question 2

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4. True or False?

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

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

Question 4

Density-dependent factors become less effective as the population size increases. True or False?

Accepted Answer

A) True 
 B)False

Question 5

An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration. What is the growth rate (r)of the painted turtle population?

Accepted Answer

A)  0.4 . 
B) 0.2 
C)   0.2, 
D) 0.4 
E) 0.6 
A)  0.4 . 
B) 0.2 
C)   0.2, 
D) 0.4 
E) 0.6

Question 6

Why has it been so hard to come up with an accurate measure of Earth's carrying capacity for humans?

Accepted Answer

Humans have the ability to inc

Question 7

If most of the individuals of a species die when they are young, that species exhibits a(n)________ survivorship curve.

Accepted Answer

A) convex 
B) constant 
C) concave 
D) S-shaped 
E) declining 
A) convex 
B) constant 
C) concave 
D) S-shaped 
E) declining

Question 8

Gum bush releases a chemical from its roots that prevents any seeds from germinating in the soil above the roots. This is an example of:

Accepted Answer

A) social competition. 
B) predation. 
C) parasitism. 
D) contest competition. 
E) scramble competition. 
A) social competition. 
B) predation. 
C) parasitism. 
D) contest competition. 
E) scramble competition.

Question 9

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

Accepted Answer

logistic o

Question 10

Based on the data in the table, this population has a(n)________ growth pattern?

Accepted Answer

A) exponential 
B) boom-and-bust 
C) scramble competition 
D) J-curve 
E) S-curve 
A) exponential 
B) boom-and-bust 
C) scramble competition 
D) J-curve 
E) S-curve

Question 11

Parasitism is a density-dependent population control. True or False?

Accepted Answer

A) True 
 B)False

Question 12

In his 1798 book, An Essay on the Principle of Population, Thomas Malthus stated: "the power of [Earth's human] population [to increase] is indefinitely greater than the power in the earth to produce subsistence for man." He explained that our population increases exponentially while we can increase our food supply only linearly. In modern terminology, what did Malthus mean by "the power in the earth to produce subsistence for man"?

Accepted Answer

A) biotic potential 
B) birth rate 
C) carrying capacity 
D) environmental resistance 
E) growth rate 
A) biotic potential 
B) birth rate 
C) carrying capacity 
D) environmental resistance 
E) growth rate

Question 13

If a caterpillar eats all the seedlings in your garden, killing all of them, the caterpillar is acting as a:

Accepted Answer

A) predator. 
B) parasite. 
C) competitor. 
D) density-independent factor. 
E) saprophyte. 
A) predator. 
B) parasite. 
C) competitor. 
D) density-independent factor. 
E) saprophyte.

Question 14

The population shown in the pyramid is:

Accepted Answer

A) expanding. 
B) stable. 
C) going through a boom-and-bust cycle. 
D) showing continuous exponential growth. 
E) decreasing. 
A) expanding. 
B) stable. 
C) going through a boom-and-bust cycle. 
D) showing continuous exponential growth. 
E) decreasing.

Question 15

A population of rabbits introduced into an island grew rapidly for a few years and then the growth slowed down. Why did the population become stable?

Accepted Answer

A) The carrying capacity was reached. 
B) Environmental resistance declined. 
C) The rate of immigration declined. 
D) The value of r decreased. 
E) A bust cycle was about to begin. 
A) The carrying capacity was reached. 
B) Environmental resistance declined. 
C) The rate of immigration declined. 
D) The value of r decreased. 
E) A bust cycle was about to begin.

Question 16

An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration. What is the birth rate per year for this population?

Accepted Answer

A) 0)4 
B) 0)6 
C) 20 
D) 40 
E) 60 
A) 0)4 
B) 0)6 
C) 20 
D) 40 
E) 60

Exam 26: Population Growth and Regulation

Developing countries tend to have a(n)________ age structure diagram.

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4. True or False?

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

Density-dependent factors become less effective as the population size increases. True or False?

An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration. What is the growth rate (r)of the painted turtle population?

Why has it been so hard to come up with an accurate measure of Earth's carrying capacity for humans?

If most of the individuals of a species die when they are young, that species exhibits a(n)________ survivorship curve.

Gum bush releases a chemical from its roots that prevents any seeds from germinating in the soil above the roots. This is an example of:

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

Based on the data in the table, this population has a(n)________ growth pattern?

Parasitism is a density-dependent population control. True or False?

If a caterpillar eats all the seedlings in your garden, killing all of them, the caterpillar is acting as a:

The population shown in the pyramid is:

A population of rabbits introduced into an island grew rapidly for a few years and then the growth slowed down. Why did the population become stable?

An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration. What is the birth rate per year for this population?

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

The Continuity of Life: Cellular 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 Amidst 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

How Do Ecosystems Work

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

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