Unit 4 Biodiversity Quiz Review

A(n) __________ is any species that is essential to the health of an ecosystem.

• keystone species

• foundation species

• cornerstone species

• king species

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Which of the following is part of a rabbit’s niche?

• undergrowth of the forest

• a fox

• having many offspring

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

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Reasons for preserving biodiversity include all of the following except

• isolating unique genetic material so it can be incorporated into existing crops.

• increasing the chances of discovering organisms with medicinal value.

• preventing natural evolution.

• finding new plants that can supplement the world’s food supply.

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Organisms can adapt

• to their physical surroundings.

• to other organisms

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The major human causes of extinction today are

• hunting and destroying habitats.

• polluting and introducing non-native species.

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How many species are estimated to be living on Earth?

• between 10,000 and 100,000

• between 8 and 50 million

• between 1 and 2 million

• between 500,000 and 1 million

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Reintroducing the gray wolf in certain areas of the northwestern United States

• is beneficial for all of those organisms living in that area.

• creates a mutualist interaction between wolves and elks.

• is in accordance with the U.S. Endangered Species Act of 1973.

• discourages hunters from hunting other animals.

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What level of biodiversity is most commonly equated with the overall concept of biodiversity?

• genetic diversity

• species diversity

• ecosystem diversity

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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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