Biology (Raven), 10th Edition

Chapter 57: Dynamics of Ecosystems

Pre-Test

1
Burning of fossil fuels has created an imbalance in which cycle?
A)water
B)nitrogen
C)carbon
D)phosphorus
E)sodium
2
In ecosystems, ecologists recognize a limited number of feeding levels or _________levels.
A)consumer
B)limiting nutrient
C)productivity
D)trophic
E)energy
3
How could an increase in species in lower trophic levels be explained?
A)removal of species in trophic level above
B)bottom-up effects
C)removal of herbivores
D)decrease in producers
E)All choices are correct.
4
According to the Cedar Creek studies, higher species richness results in what outcome?
A)less year-to-year variation in biomass
B)greater resistance to drought
C)greater resistance to non-native species
D)All choices are possible outcomes.
E)No choice is correct.
5
The _____ model proposes that extinction and colonization reach a balance point.
A)extinction-balance
B)colonization-balance
C)extinction/colonization-balance
D)island
E)equilibrium
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