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- 1. Multiple Choice
A(n) __________ is any species that is essential to the health of an ecosystem.
keystone species
foundation species
cornerstone species
king species
- 2. Multiple Choice
Which of the following is part of a rabbit’s niche?
undergrowth of the forest
a fox
having many offspring
- 3. Multiple Choice
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
- 4. Multiple Choice
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.
- 5. Multiple Choice
Organisms can adapt
to their physical surroundings.
to other organisms
- 6. Multiple Choice
The major human causes of extinction today are
hunting and destroying habitats.
polluting and introducing non-native species.
- 7. Multiple Choice
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
- 8. Multiple Choice
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.
- 9. Multiple Choice
What level of biodiversity is most commonly equated with the overall concept of biodiversity?
genetic diversity
species diversity
ecosystem diversity
- 10. Multiple Choice
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.
- 11. Multiple Choice
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.
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