Biology, Eighth Edition (Raven)

Chapter 59: Conservation Biology

Pre Test

1
The fossil record shows that 99% of all species that have ever existed are now extinct. Given this, why should we be concerned about the current rate of extinction? (p. 1238 )
A)It is caused largely by human activity.
B)It is very rapid.
C)Endemic species hotspots are particularly threatened.
D)Since only a small fraction of species have been described we don't know what valuable species have been lost.
E)all of the above
2
What is the most important reason for maintaining biodiversity? (p. 1242)
A)direct economic benefits
B)indirect economic benefits
C)ethical reasons
D)aesthetic reasons
E)all of the above
3
What is the major factor responsible for causing species extinctions today? (p 1245)
A)introduced species
B)overexploitation
C)habitat loss
D)catastrophic disturbances
E)loss of genetic variability
4
Sometimes an ecosystem has been disrupted by a single introduced species. Removal of the species is all that is necessary to allow the ecosystem to recover. (p. 1256)
A)True
B)False
5
It is not sufficient to just preserve the most important species within an ecosystem to ensure ecosystem health. (p. 1258)
A)True
B)False
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