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SampleEcologyQuestions2 - inverted pyramids of trophic...

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1. In the graph above, what is signified by the point at which the per capita death rate and per capita birth rate cross? a. The population carrying capacity b. A density independent population equilibrium point c. A density dependent population equilibrium point d. The point at which immigration equals extinction e. The point at which individuals in the population experience their highest per capita survival rate 2. Why do desert biomes tend to occur at 30 o North and South Latitutdes on Earth? a. Sandy desert soils have poor water retention b. Downward circulating air cells that rise at the equator absorb moisture c. Vegetation in deserts does not create moist microclimates like vegetation in forests d. Most deserts are far form the ocean e. Mountains at this latitude create rain shadows 3. Which characteristics are not likely to occur in primary producers that support
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Unformatted text preview: inverted pyramids of trophic level biomass? a. Rapid growth rates b. High allocation to defense c. Early age at first reproduction d. High food quality for grazers e. Small body s Population Density Per capita death rate Per capita birth rate 4. The unfilled points (white circles and triangles) on the graph below indicate that an assumption of the MacArthur-Wilson Equilibrium Theory of Island Biogeography has been violated (is not true). Which assumption is it? a. Island area matters much more than heterogeneity of habitats on an island b. Species are equal in their vagility (dispersal ability) c. Species richness has attained dynamic equilibrium, so that history has no effect on number of species on an island of a given area. d. Speciation is not an important process adding to the richness of island biota. e. Extinction rates increase with species richness Answers: 1c, 2b, 3b, 4c...
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