5 Written questions
5 Matching questions
- Which of the following statements about keystone species is NOT true?
A. The extinction of keystone species can lead to other extinctions and a loss of biodiversity.
B. Keystone species are defined as a population subdivided into several small isolated populations due to habitat fragmentation.
C. Examples of keystone species are grizzly bears, bats, beavers and alligators.
D. The numbers of individuals in the keystone species in their respective community may or may not be excessively high.
- Which of the following statements about extinction is TRUE?
A. Overexploitation by hunting and fishing is the major threat to tropical animals and plants.
B. Without human activity, all species would survive and there would be no extinctions.
C. Endangered wild species often become extinct due to different combinations of factors.
D. Commercial hunting and fishing are careful not to deplete animal reserves.
E. Introduction of new exotic species helps preserve biodiversity and slow extinction.
- ______ is a phenomenon in which the edges around a landscape patch provide a slightly different habitat than the favorable habitat in the interior of the patch.
A. The edge effect
C. Sustainable development
D. Landscape preservation
- A _______ population lives in favorable conditions where the birthrate exceeds the death rate and individuals move into other, less successful, fragmented populations.
- When the factors causing habitat decline are identified and a procedure is developed to remedy this, it is
A. the edge effect.
B. a habitat restoration plan.
C. a population viability analysis.
D. a gap analysis.
E. landscape dynamics.
- a B. source
- b A. The edge effect
- c B. a habitat restoration plan.
- d B. Keystone species are defined as a population subdivided into several small isolated populations due to habitat fragmentation.
- e C. Endangered wild species often become extinct due to different combinations of factors.
5 Multiple choice questions
- C. A lake can die due to eutrophication, which is a lack of nutrients.
- B. Habitat loss
- D. A, B, and C only are correct.
5 True/False questions
Which of the following statements about biological diversity is NOT true?
A. Scientists estimate that 10-50 million species exist.
B. Biodiversity is described in terms of genetic, community, and landscape diversity.
C. Biodiversity refers to the variety of life on Earth.
D. Biodiversity is evenly distributed throughout the biosphere.
E. Many species that are in danger of extinction have not been identified and studied. → D. Biodiversity is evenly distributed throughout the biosphere.
_______ when the number of individuals taken from a wild population is so great that the population becomes severely reduced in number.
A. Overexploitation occurs
B. A source population is formed
C. An "edge effect" occurs
D. Eutrophication occurs → A. Overexploitation occurs
Landscape preservation is often intended for one particular organism but may benefit others.
True False → False
When habitats are fragmented so that populations are subdivided into several small and isolated groups, they form a
A. sink population.
B. biodiversity hotspot.
C. keystone species.
D. source population.
E. metapopulation. → E. metapopulation.
Which of the following organisms is NOT an example of an alien or exotic species?
A. zebra mussels introduced to the Great Lakes
B. dandelions planted by pioneers as salad greens
C. the mongoose brought to Hawaii to control rats
D. water hyacinths
E. All of these are examples of introduced alien species. → D. A, B, and C only are correct.