Population Dynamics
1. Population growth that increases by a constant amount per unit of time is called (p. 121)
A. exponential.
B. arithmetic.
C. chaotic.
D. geometric.
E. none of the above.
2. Population growth that increase by a constant fraction per unit of time is called (p. 121)
A. exponential.
B. arithmetic.
C. chaotic.
D. biotic.
E. none of the above.
3. If a population grows at a annual increase of 1% per year, how long would it take until the population has doubled? (p. 122)
A. about 1000 years
B. about 10,000 years
C. about 10 years
D. about 70 years
E. none of the above
4. Which organism has the greatest biotic potential? (p. 122)
A. elephants
B. moose
C. humans
D. whales
E. houseflies
5. The extent to which a population exceeds the carrying capacity of the environment is called (pp. 122-123)
A. dieback.
B. overshoot.
C. irruptive growth.
D. environmental resistance.
E. logistic growth.
6. A species that grows exponentially when resources are unlimited and then suffers a dieback when it has reached the carrying capacity displays which population growth characteristic? (p. 123)
A. irruptive, or Malthusian, growth
B. overshoot
C. chaotic system
D. logistic growth
E. none of the above
7. A species that grows exponentially when its resources are unlimited but whose growth slows before it reaches the carrying capacity displays which population growth characteristic? (p. 123)
A. irruptive, or Malthusian growth
B. overshoot
C. chaotic system
D. logistic growth
E. none of the above
8. The factors that tend to reduce a species' growth rate before it reaches the carrying capacity are collectively called (p. 123)
A. environmental resistance.
B. an S curve.
C. chaotic systems.
D. normal conditions.
E. none of the above.
9. In general, organisms that display Malthusian, or irruptive, population growth (p. 124)
A. occupy low trophic levels.
B. occupy high trophic levels.
C. provide much intensive care for their young.
D. A and B.
E. B and C.
10. In general, organisms that display logistic population growth (p. 125)
A. occupy low trophic levels.
B. occupy high trophic levels.
C. provide much intensive care for their young.
D. A and B.
E. B and C.
11. An organism that has the physical ability to produce offspring displays (p. 126)
A. fertility.
B. mortality.
C. population momentum.
D. fecundity.
E. none of the above.
12. As a scientist, you plot an age structure diagram of a population and it resembles a pyramid. This means the population (p. 127)
A. is declining.
B. is expanding.
C. is stable.
D. is emigrating.
E. none of the above.
13. Density-independent factors that regulate population include all of the following EXCEPT (p. 128)
A. extreme cold, or moderate cold at an especially critical time of year.
B. fire in a grassland biome.
C. supply of food.
D. drought.
E. severe storms.
14. In terms of population ecology, interspecific interactions include all of the following EXCEPT (p. 129)
A. predation.
B. parasitism.
C. competition over environmental resources.
D. competition over mates.
E. mutualism.
15. When population densities get very high, organisms often exhibit (p. 129)
A. stress shock, or stress related diseases.
B. mutualism.
C. interspecific-interactions.
D. higher natality.
E. none of the above.