AnswersTPS EdX BiologySuccession and Extinction

Succession and Extinction — Quiz Answers

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1
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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
the effect of a large herd of elephants on the grasses and shrubs in an area
C
the formation of Surtsey, a volcanic island off of the southern coast of Iceland
D
controlled burning to stimulate the growth of forest trees such as sequoia
2
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Which statement best describes ecological succession?

A
It never occurs in a predictable pattern.
B
It is always caused by human intervention.
C
It is a series of rapid changes in an ecosystem.
D
It occurs after a disturbance.
3

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

A
succession and poaching
B
habitat loss and predation
C
pollution and succession
D
poaching and habitat loss
4

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

A
to provide fruit
B
to produce the soil
C
to destroy parasites
D
to provide shade
5

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

A
secondary succession
B
a climax community
C
increased biodiversity
D
primary succession
7

How does a whale fall community affect ocean sediment?

A
The bacteria that are attracted break down the sediment nearby.
B
The remains of the whale pollute the sediment.
C
The sediment is transformed into food for mussels and crabs.
D
The decomposition of the whale enriches the sediment.
8

Which factor can cause secondary succession?

A
clear cutting
B
glacial melting
C
competition
D
predation
10

Why are lichens a good pioneer species after a volcanic eruption?

A
They are able to grow on moist soil.
B
They are able to attract animals.
C
They are able to grow on bare rock.
D
They are able to grow without water.

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