1. Which of the following is NOT one of the factors that play a role in population growth rate?
immigration
death rate
emigration
demography 1 2 3 4 5

2. One of the main characteristics of a population is its
change over time.
geographic distribution.
dynamics.
habitat. 1 2 3 4 5

3. Sea otters are important to the populations of
kelp.
sea urchins.
killer whales.
all of the above 1 2 3 4 5

4. geographic distribution age structure population density
There are 150 Saguaro cactus plants per square kilometer in a certain area of Arizona desert. To which population characteristic does this information refer?
growth rate
geographic distribution
age structure
population density 1 2 3 4 5

5. What does the range of a population tell you that density does not?
the number that live in an area
the areas inhabited by a population
the births per unit area
the deaths per unit area 1 2 3 4 5

6. 0.03 individuals per square kilometer
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?
0.03 individuals per square kilometer
53 individuals per square kilometer
30 individuals per square kilometer
10.24 individuals per square kilometer 1 2 3 4 5

7. Which of the following tells you population density?
the number of births per year
the number of frogs in a pond
the number of deaths per year
the number of bacteria per square millimeter 1 2 3 4 5

8. The movement of organisms into a given area from another area is called
immigration.
emigration.
population shift.
carrying capacity. 1 2 3 4 5

9. When organisms move out of the population, this is known as
emigration.
abandonment.
immigration.
succession. 1 2 3 4 5

10. What must occur in a population for it to grow?
The birthrate becomes higher than the death rate.
The birthrate stays the same and the death rate increases.
The birthrate becomes lower than the death rate.
The birthrate and the death rate remain the same. 1 2 3 4 5

11. What is happening in a population as it decreases?
The birthrate and the death rate remain the same.
The death rate becomes lower than the birthrate.
The death rate stays the same and the birthrate increases.
The death rate becomes higher than the birthrate. 1 2 3 4 5

12. If immigration and emigration numbers remain equal, which is the most important contributing factor to a slowed growth rate?
increased birthrate
constant death rate
decreased birthrate
constant birthrate 1 2 3 4 5

13. Which are two ways a population can decrease in size?
immigration and emigration
increased death rate and immigration
decreased birthrate and emigration
emigration and increased birthrate 1 2 3 4 5

14. When individuals in a population reproduce at a constant rate, it is called
logistic growth.
growth density.
exponential growth.
multiple growth. 1 2 3 4 5

15. exponential growth curve. normal curve. population curve.
The various growth phases through which most populations go are represented on a(an)
logistic growth curve.
exponential growth curve.
normal curve.
population curve. 1 2 3 4 5

16. As resources in a population become less available, the population
declines rapidly.
increases slowly.
reaches carrying capacity.
enters a phase of exponential growth. 1 2 3 4 5

17. Which factor might NOT contribute to an exponential growth rate in a given population?
lower death rates
higher birthrates
less competition
reduced resources 1 2 3 4 5

18. reaches carrying capacity. grows quickly. growth begins to slow down.
In a logistic growth curve, exponential growth is the phase in which the population
reaches carrying capacity.
grows quickly.
growth begins to slow down.
growth stops. 1 2 3 4 5

19. When the exponential phase of a logistic growth curve of a population ceases,
the size of the population drops.
the size of the population stays the same.
population growth begins to slow down.
population growth begins to speed up. 1 2 3 4 5

20. A biotic or an abiotic resource in the environment that causes population size to decrease is a
carrying capacity.
limiting nutrient.
limiting factor.
growth factor. 1 2 3 4 5

21. All of the following are limiting factors EXCEPT
immigration.
competition.
predation.
human disturbances. 1 2 3 4 5

22. Which of the following is NOT likely to be a limiting factor on the sea otter population?
disease
competition
drought
predation 1 2 3 4 5

23. Which will reduce competition within a species’ population?
fewer individuals
higher birthrate
fewer resources
higher population density 1 2 3 4 5

24. If a population grows larger than the carrying capacity of the environment, the
death rate may rise.
birthrate may rise.
death rate must fall.
birthrate must fall. 1 2 3 4 5

25. Water lilies do not grow in desert sand because water availability to these plants in a desert is
a limiting factor.
the carrying capacity.
a competition factor.
none of the above 1 2 3 4 5

26. A limiting nutrient is to ecosystem productivity as a limiting factor is to population
birthrate.
density.
growth rate.
immigration. 1 2 3 4 5

27. Each of the following is a density-dependent limiting factor EXCEPT
competition.
seasonal cycles.
crowding.
disease. 1 2 3 4 5

28. Which would be least likely to be affected by a density-dependent limiting factor?
a small, scattered population
a population with a high birthrate
a large, dense population
a population with a high immigration rate 1 2 3 4 5

29. Which of the following is a density-independent limiting factor?
earthquake
disease
emigration
parasitism 1 2 3 4 5

30. Which density-dependent factors other than the predator/prey relationship affected the populations of moose and wolves on Isle Royale?
extreme temperatures for the moose and flooding for the wolves
parasitic wasps for the wolves and clear-cut forest for the moose
a hurricane followed by drought for both moose and wolves
food availability for the moose and disease for the wolf 1 2 3 4 5

31. A disease resulting in the deaths of one third of a dense population of bats in a cave would be a
density-dependent limiting factor.
result of exponential growth.
density-independent limiting factor.
nutrient-limiting factor. 1 2 3 4 5

32. Which of the following would NOT be a limiting factor to the size of a large, dense population?
a struggle for food, water, space, or sunlight
predator/prey relationships
a struggle to find shelter from a natural disaster
parasitism and disease 1 2 3 4 5

33. Human population growth has slowed down in
China.
the United States.
India.
Africa. 1 2 3 4 5

34. Demography is the scientific study of
parasitism and disease.
modernized countries.
human populations.
none of the above 1 2 3 4 5

35. Demographic transition is change from high birthrates and high death rates to
exponential growth.
a low birthrate and a low death rate.
a low birthrate and a high death rate.
indefinite growth. 1 2 3 4 5

36. About 500 years ago, the world’s population started
decreasing.
to reach carrying capacity.
growing more rapidly.
to level off. 1 2 3 4 5

37. Countries in the first stage of demographic transition have
a low death rate and a high birthrate.
a high death rate and a low birthrate.
a slowly growing population.
more old people than young people. 1 2 3 4 5

38. Demographic transition begins with changes in society that
lower the birthrate.
increase the birthrate.
lower the death rate.
increase the death rate. 1 2 3 4 5

39. The human population experienced exponential growth after
agriculture began.
plowing and irrigation began.
the bubonic plague began.
the Industrial Revolution began. 1 2 3 4 5

40. Which country has not yet completed the demographic transition?
United States
India
Great Britain
Japan 1 2 3 4 5

41. The anticipated human population by the year 2050 is about
7.8 billion.
9 billion.
9 trillion.
78 billion. 1 2 3 4 5

42. has a steady growth rate. will decrease in 30 years.
In Rwanda, there are more young children than teenagers, and more teenagers than adults. This age structure indicates a population that
has stopped growing.
will double in 30 years.
has a steady growth rate.
will decrease in 30 years. 1 2 3 4 5

43. In countries like India, the human population is growing
exponentially.
transitionally.
logistically.
demographically. 1 2 3 4 5

44. Most of the worldwide human population is growing exponentially because
human populations have not reached their exponential curve.
human populations have not yet completed the demographic transition.
human populations do not conform to the logistic model.
science and technology have made it possible. 1 2 3 4 5

45. How can a diagram of a population’s age structure predict how it can grow?
It shows how many people are at reproductive ages.
It shows how many people will probably die within a few years.
It shows how many people are entering the population by birth.
all of the above 1 2 3 4 5

46. The number of individuals per unit area is a population’s growth rate
True
False 1 2 3 4 5

47. If the death rate of a population is greater than the birthrate, the population shrinks. _________________________
True
False 1 2 3 4 5

48. There are about four million births per year in the United States
There are about four million births per year in the United States. This statistic is a population dynamic called growth rate. _________________________
True
False 1 2 3 4 5

49. Logistic growth occurs when a population’s growth slows or stops, following a period of rapid growth. _________________________
True
False 1 2 3 4 5

50. Under conditions of logistic growth, population size will rise and fall around an average point called the carrying capacity. _________________________
True
False 1 2 3 4 5

51. The exponential model of population growth accounts for the influence of carrying capacity. _________________________
True
False 1 2 3 4 5

52. One of the best-known mechanisms of population control is the parasite-host relationship. _________________________
True
False 1 2 3 4 5

53. Predators can limit the size of populations by weakening their hosts, resulting in disease or death. _________________________
True
False 1 2 3 4 5

54. Human activities, such as damming rivers, are density-independent limiting factors. _________________________
True
False 1 2 3 4 5

55. Density-dependent limiting factors affect all populations, whether the population size is two or a hundred. _________________________
True
False 1 2 3 4 5

56. Resource shortages triggered by increasing population size are density-independent limiting factors. _________________________
True
False 1 2 3 4 5

57. The size of the human population tends to increase with time
True
False 1 2 3 4 5

58. The human population grew slowly from the beginning of human existence, and then began to grow exponentially about 200 years ago. _________________________
True
False 1 2 3 4 5

59. 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. _________________________
True
False 1 2 3 4 5

60. An indication that a country has completed the demographic transition is a low birthrate and a low death rate. _________________________
True
False 1 2 3 4 5

61. Participant Scores Participant 1 Participant 2 Participant 3
Participant 1
Participant 2
Participant 3
Participant 4
Participant 5

62. A population can be characterized by its geographic distribution, density, growth rate, and _________________________. 1 2 3 4 5
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63. Emigration can cause a population to ____________________ in size.1 2 3 4 5
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64. When an individual moves into one population from a different population, it is called ____________________. 1 2 3 4 5
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65. Under ideal conditions with unlimited resources, a population will grow ____________________.1 2 3 4 5
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66. Zero population growth is a characteristic of ____________________ population growth.1 2 3 4 5
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67. A population of bacteria with a limited supply of nutrients will eventually show growth typical of the ____________________ model. 1 2 3 4 5
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68. If an entire wolf population dies, the moose population on which it preys will grow to the environment’s ____________________. 1 2 3 4 5
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69. Competition, predation, parasitism, and ____________________ are density-dependent limiting factors.1 2 3 4 5
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70. Density-dependent ____________________ factors in natural populations help keep them from increasing indefinitely. 1 2 3 4 5
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71. The rise-and-fall cycle of a predator-prey relationship is a density-____________________ relationship. 1 2 3 4 5
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72. A diagram that illustrates how many people of different ages and gender are presently living in a country is called a(an) ______________________________. 1 2 3 4 5
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73. The change in growth rate that results from the change in birthrates and death rates is known as a ______________________________. 1 2 3 4 5
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74. During early human history, the growth rate was low because the birthrate was high and the death rate was ____________________. 1 2 3 4 5
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75. Social and ____________________ factors explain why some countries have high growth rates, whereas other countries grow slowly or not at all. 1 2 3 4 5
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76. The exponential growth rate of some countries indicates that these countries have not yet fully ____________________ socially and economically. 1 2 3 4 5
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77. What are four main characteristics of a population?1 2 3 4 5
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78. How does emigration affect population size?1 2 3 4 5
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79. 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? 1 2 3 4 5
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80. Why must wildlife biologists consider immigration and emigration when studying certain animals?1 2 3 4 5
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81. Describe the graph of exponential growth.1 2 3 4 5
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82. Describe the period of growth on a logistic growth curve just before carrying capacity is reached.1 2 3 4 5
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83. What is a limiting factor? Give two or three examples1 2 3 4 5
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84. What is a density-independent limiting factor
What is a density-independent limiting factor? Give two or three examples 1 2 3 4 5
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85. What are some factors that keep a population from growing further once it reaches the carrying capacity of its environment? 1 2 3 4 5
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86. Why did the human population begin growing exponentially about 500 years ago?1 2 3 4 5
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87. What kept the human growth rate low before the Industrial Revolution?1 2 3 4 5
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88. How can a demographer, or scientist who studies demography, predict how a population will change in the future? 1 2 3 4 5
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89. What are some of the factors that economists believe will overcome the negative impacts of the growth of the human population? 1 2 3 4 5
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90. How does population growth in the United States compare with that in China and India?1 2 3 4 5
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91. What evidence is there that Japan has completed the demographic transition?1 2 3 4 5
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92. How can different population sizes affect density in areas of the same size? Give an example1 2 3 4 5
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93. Discuss four ways population sizes can change.1 2 3 4 5
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94. Differentiate between exponential and logistic growth.1 2 3 4 5
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95. Explain the limiting factors that control population growth.1 2 3 4 5
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96. Explain how predator and prey populations limit each other’s growth rates.1 2 3 4 5
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97. Differentiate between density-dependent and density-independent limiting factors.1 2 3 4 5
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98. Competition can be a major force behind evolutionary change
Competition can be a major force behind evolutionary change. How does this competition relate to density-dependent competition? 1 2 3 4 5
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99. Sequence the historical events that contributed to the current human population growth.1 2 3 4 5
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100. Compare some ecologists’ view of world population growth with that of some economists.1 2 3 4 5
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101. What is the future of worldwide population growth?1 2 3 4 5
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