Question 1

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

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Question 2

What factors determine the natural increase of a population?

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Question 3

How do interspecific and intraspecific competition differ?

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Question 4

Density-dependent factors become more effective at limiting population growth as the size of the population_________ .

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Question 5

Predation is considered a density-dependent factor that controls the population size of prey species. Give two examples of predators acting in density-dependent ways in response to fluctuations in the size of prey populations.

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Question 6

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

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Question 7

Competition among individual members of the same species is referred to as_________competition.

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Question 8

In the United States today, there is a trend toward women having their first child in their late 30s or early 40s. In contrast, a few decades ago, most women started having children in their early 20s. What effect would you expect this change to have on population growth in the United States? Would it have any effect if the number of children per woman remains the same? Explain.

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Question 9

A species that is transferred to a new environment where it has little environmental resistance and experiences an explosive population growth is called a(n)_________species.

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Question 10

How does environmental resistance affect a population?

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Question 11

What is the term for regular population cycles of rapid growth followed by massive die-off?

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Question 12

How does the environment limit population growth?

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Question 13

Write an equation that describes a situation in which a population remains stable.

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Question 14

Explain what happens in exponential population growth.

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Question 15

Human populations have continued to grow because humans have increased Earth?s_________through agriculture, medicine, and technology.

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Question 16

Parasites often kill their hosts, although they do not directly benefit from their hostsʹ death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

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Question 17

Why does a bacteria population have a higher biotic potential than a population of humans?

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Question 18

Predation is considered to be a density-_________ factor that controls the size of the prey population.

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Question 19

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

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Question 20

What term describes the maximum population size that the environment can support indefinitely?

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Quiz 27: Population Growth and Regulation