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1 | |
A strong interaction, according to Paine, involves: |
| | A) | the power that can be applied by an organism to a fixed object |
| | B) | keystone species |
| | C) | the highest levels of energy flow within the community |
| | D) | the largest carnivore |
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2 | |
A starfish removal experiment performed by Paine, showed that: |
| | A) | without the predator, species richness declined |
| | B) | barnacle populations were the same, with or without the starfish |
| | C) | aquatic food webs could not be understood by looking at use of space |
| | D) | because of low biomass, starfish were poorly adapted for intertidal conditions |
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3 | |
Lubchenko followed Paine and showed that in intertidal food webs: |
| | A) | feeding preferences are important |
| | B) | population densities are important |
| | C) | competitive abilities are important |
| | D) | all of the above |
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4 | |
In Lake Victoria, the Nile perch is considered: |
| | A) | an unwelcome herbivore that exerts control over native species |
| | B) | an agent of net gain for food web complexity |
| | C) | a food web simplifier |
| | D) | rare, but efficient |
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5 | |
An apparent pattern in human-occupied tropical forests is: |
| | A) | an increase in populations of medium-sized mammals |
| | B) | that population thresholds do not appear to exist |
| | C) | that hunters become so skilled, relatively few wounded animals escape |
| | D) | that harvests were significant, but proportional to natural abundances |
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6 | |
True or False:
Nile perch, because they are cannibalistic, occupy two levels of the Lake Victoria food web. |
| | A) | True |
| | B) | False |
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7 | |
True or False:
A key element of Power’s experiment with stream fish was that they could enter and leave the enclosures at will, thus revealing their prey preferences. |
| | A) | True |
| | B) | False |
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8 | |
True or False:
Even small organisms such as ants can be considered keystone species. |
| | A) | True |
| | B) | False |
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9 | |
True or False:
Even agricultural ecosystems can feature keystone species. |
| | A) | True |
| | B) | False |
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10 | |
True or False:
It is unlikely that human preferences or actions have altered roles of species we encounter today. |
| | A) | True |
| | B) | False |
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2002 McGraw-Hill Higher Education