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Succession and Extinction — Unit test Answers

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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
2
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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
3

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
4

Which bar graph best represents the provided data?Cause of extinctionPercentage of total extinctionsIntroduced species39Habitat loss36Hunting and poaching23Other 2

A
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 36 percent; Habitat loss, 23 percent; Other, 2 percent.
Option A
B
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 40 percent; Hunting and poaching, 20 percent; Habitat loss, 40 percent; Other, 0 percent.
Option B
C
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 2 percent; Habitat loss, 36 percent; Other, 0 percent.
Option C
D
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 23 percent; Habitat loss, 36 percent; Other, 2 percent.
Option D
5

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
6

On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5.1 earthquake. During the eruption, hot ash and pumice poured down the west, south, and east sides of the mountain, melting the snow and ice at the top of the volcano and producing volcanic mudflows. Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?

A
primary succession
B
secondary succession
C
a climax community
D
species extinction
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

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
9

What is most likely to result immediately after a rainforest in Brazil is clear-cut?

A
secondary succession
B
primary succession
C
a climax community
D
increased biodiversity
10

Which is one event that may lead to Primary succession?

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

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