AnswersCA-Life Science B High SchoolPopulation Growth

Succession and Extinction Answers

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Which disturbance would result in primary succession?

A
harvesting wheat by using a combine harvester at the end of the growing season
B
controlled burning to stimulate the growth of forest trees such as sequoia
C
the formation of Surtsey, a volcanic island off of the southern coast of Iceland
D
the effect of a large herd of elephants on the grasses and shrubs in an area
2
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According to the pie chart, which cause results in the most extinctions?

Question illustration
A
other
B
introduced species
C
habitat loss
D
hunting and poaching
3

Which of the following could result in the extinction of a species?

A
harsh restrictions on poachers
B
increase in the habitat size of a species
C
adding a new species to the habitat
D
decrease tourism in protected areas
4

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

A
endangered
B
threatened
C
extinct
D
pioneer
5

Which factor can cause secondary succession?

A
clear cutting
B
glacial melting
C
competition
D
predation
6

Rhinoceroses are being poached at a rate of two or three a week in Africa and Asia. Which type of diversity is being lost as the population of rhinoceroses becomes very small?

A
species diversity
B
genetic diversity
C
ecosystem diversity
D
fragmented diversity
7

Which statement best describes ecological succession?

A
It is always caused by human intervention.
B
It occurs after a disturbance.
C
It never occurs in a predictable pattern.
D
It is a series of rapid changes in an ecosystem.
8

Which is one event that may lead to Primary succession?

A
clear-cutting
B
climate change
C
volcanic eruption
D
introduced species
9

The diagram below shows the stages of succession in a forest ecosystem. Which area shows the climax community of secondary succession?

Question illustration
A
A
B
B
C
C
D
D
10

What is the role of a pioneer species in primary succession?

A
to destroy parasites
B
to provide shade
C
to provide fruit
D
to produce the soil

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