Chapter 47: Q 9. (page 1400)
A secondary plant compound might be used for which of
the following?
a. a new crop variety
b. a new drug
c. a soil nutrient
d. a pest of a crop pest
The correct option is (b).
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Which two extinction risks may be a direct result of the
pet trade?
a. climate change and exotic species introduction
b. habitat loss and overharvesting
c. overharvesting and exotic species introduction
d. habitat loss and climate change
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
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.
Describe what happens to an ecosystem when a keystone species is removed.
A mass extinction is defined as ________.
a. a loss of 95 percent of species
b. an asteroid impact
c. a boundary between geological periods
d. a loss of 50 percent of species
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