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Succession and Extinction Answers

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1
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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
2
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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.
3

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
4

How does a whale fall community affect ocean sediment?

A
The decomposition of the whale enriches the sediment.
B
The remains of the whale pollute the sediment.
C
The sediment is transformed into food for mussels and crabs.
D
The bacteria that are attracted break down the sediment nearby.
5

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
6

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
7

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
8

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
9

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
10

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

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