AnswersCO-Biology B-CRUnit Test

Succession and Extinction Answers

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1
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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
2
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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
3

Which factor can cause secondary succession?

A
clear cutting
B
glacial melting
C
competition
D
predation
4

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
5

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
6

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.
7

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
8

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
9

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
10

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

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