Ecology 10:2 Biodiversity at Risk

A mass extinction is ___

• a rapid increase in biodiversity.

• the introduction of exotic species.

• the extinction of many species in a short period of time.

• a benefit to the environment.

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An endangered species is

• a species in danger of extinction.

• a species growing on public land.

• an organism brought to a place where it has not lived before.

• a species that has disappeared entirely.

In what part of the world are the greatest number of extinctions occurring?

• in tropical rain forests

• in deserts

• in the Arctic

• in Europe and the United States

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. The current rate of species extinction is

• slower than at any other time in this century.

• due primarily to the actions of humans.

• the result of natural environmental processes.

• of little consequence to Earth’s long-term survival.

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The fact that organisms are adapted to survive in particular environments helps to explain why

• captive-breeding programs are often ineffective.

• non-native plant species never flourish in new areas.

• habitat destruction accounts for most extinctions.

• compromise is impossible on environmental issues.

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A(n)____ is a species that is native to a particular place and is found only there

• endangered species

• endemic species

• exotic species

• invasive species

What groups of organisms are most in danger of extinction?

• those with small populations

• those that migrate or need special habitats

• those with large populations that breed quickly

• Both (a) and (b)

The major human causes of extinction today are

• hunting and destroying habitats.

• polluting and introducing non-native species.

• Both (a) and (b)

• Neither (a) nor (b)

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Which areas of the United States represent ecosystems with high levels of biodiversity?

• coastal California

• Hawaiian Islands

• Florida Everglades

• All of the above

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Where are many critical biodiversity hotspots located?

• cities and developed areas of the world

• islands, tropical rain forests, and coastal areas

• desert and polar environments

• All of the above

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