Transcript Which of the following could be a density-dependent factor that

Which of the following could be a
density-dependent factor that
might limit population growth?
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A. Fire
B. Storms
C. Drought
D. Food supply
E. Cold
A broad-based,
pyramid-shaped
age structure is
characteristic of a
population that is
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A. Growing rapidly
B. At carrying capacity
C. Stable
D. Limited by densitydependent factors
• E. Shrinking
A biologist wants to use the mark-recapture method to
census a population of desert mice. This will not work if
• A. The mice are territorial
• B. The mice become wary of traps
• C. The biologist waits too long before
resampling the population
• D. The mice deliberately return because the
trap contains food
• E. Any of the above
A particular species of tropical fish has only a few offspring and takes
care of them for an extended period. We might also expect the fish
population
• A. to be controlled mostly by densityindependent factors
• B. to show exponential growth
• C. to live in a harsh environment
• D. to start reproducing very young
• E. to be relatively stable, near carrying
capacity
An oak tree produces thousands of acorns, but very few grow to
mature oak trees. The oak tree exhibits a _____ survivorship curve
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A. type I
B. type II
C. type III
D. type I or II
E. type I or III
When birth rate equals death rate
• A. a population grows rapidly
• B. the size of a population remains constant
• C. density-dependent limiting factors do not
affect the population
• D. a population is in danger of extinction
• E. a population goes through up and down
factors
An organism’s “trophic level” refers to
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A. the rate at which it uses energy
B. where it lives
C. what it eats
D. whether it is early or late in ecological
succession
• E. the intensity of its competition with other
species
The relationship between species A
and species B is described as
commensalism. This means that
• A. both species suffer
• B. one species benefits and the other species
suffer
• C. both species benefit
• D. one species benefits and the other species
is unaffected
• E. any of the above is possible in
commensalism
Bacteria are especially important in
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A. the water cycle
B. the nitrogen cycle
C. ecological succession
D. the phosphorus cycle
E. recycling of energy
Two species of cuckoo doves live in a group of islands off the coast of
New Guinea. Out of 33 islands, 14 have one species, 6 have the other,
13 have neither, and none has both. What might best explain this? The
two species birds could
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A. be on different trophic levels
B. have similar niches
C. be detrivores
D. have different niches
E. be keystone predators
Answers
1. D
2. A
3. E
8. D
9. B
10. B
4. E
5. C
6. B
7. C/A