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Chapter 47: Q 11. (page 1400)
What is an ecosystem service that performs the same function as a pesticide?
a. pollination
b. secondary plant compounds
c. crop diversity
d. predators of pests
The correct option is (d)
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Describe the evidence for the cause of the Cretaceous–Paleogene (K–Pg) mass extinction.
An adaptive radiation is________.
a. a burst of speciation
b. a healthy level of UV radiation
c. a hypothesized cause of a mass extinction
d. evidence of an asteroid impact
Exotic species are especially threatening to what kind of
ecosystem?
a. deserts
b. marine ecosystems
c. islands
d. tropical forests
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
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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