AnswersCA-Life Science B High SchoolRelationships Among Organisms

Succession and Extinction Answers

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1
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Which factors involving the activities of people are a threat to biodiversity?

A
pollution and succession
B
habitat loss and predation
C
poaching and habitat loss
D
succession and poaching
2
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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
3

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.
4

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
5

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
6

In one species of bird, there are three varieties of feather color. What is this an example of?

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

Which is one event that may lead to Primary succession?

A
clear-cutting
B
climate change
C
volcanic eruption
D
introduced species
8

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
9

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
10

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

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