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Chapter 47: Q 5. (page 1400)
With an extinction rate of 100 E/MSY and an estimated 10
million species, how many extinctions are expected to
occur in a century?
a. 100
b. 10,000
c. 100,000
d. 1,000,000
The correct option is (c).
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Which of the following statements is not
supported by this graph?
a. There are more vulnerable fishes than critically
endangered and endangered fishes combined.
b. There are more critically endangered amphibians
than vulnerable, endangered and critically
endangered reptiles combined.
c. Within each group, there are more critically
endangered species than vulnerable species.
d. A greater percentage of bird species are critically
endangered than mollusk species.
The Svalbard Global Seed Vault is located on
Spitsbergen island in Norway, which has an arctic
climate. Why might an arctic climate be good for seed
storage?
Exotic species are especially threatening to what kind of
ecosystem?
a. deserts
b. marine ecosystems
c. islands
d. tropical forests
Pollination is an example of ________.
a. a possible source of new drugs
b. chemical diversity
c. an ecosystem service
d. crop pest control
The number of currently described species on the planet
is about ________.
a. 17,000
b. 150,000
c. 1.5 million
d. 10 million
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