Multiple Choice Quiz


1	A community is:
		A)	an obligate mutualism between a plant and an animal
		B)	a group of organisms that make their living in a similar way
		C)	a group of individuals capable of interbreeding
		D)	a group of populations that interact


2	A combination of richness and evenness is expressed as:
		A)	heterozygote advantage
		B)	heterogeneity
		C)	diversity
		D)	allelopathy


3	Tilman studied:
		A)	two species of diatoms
		B)	two key nutrients in lake water
		C)	conditions that allowed coexistence
		D)	all of the above


4	The reduction of prairie dog numbers in the American Great Plains has been approximately:
		A)	45%
		B)	75%
		C)	78%
		D)	98%


5	Humans appear to have influenced tropical forests in Panama for the last:
		A)	1,000 years
		B)	11,000 years
		C)	111,000 years
		D)	1.1 million years


6	Patterns of natural complexity in communities emerge when ecologists:
		A)	study one species under controlled conditions
		B)	eliminate disturbance
		C)	recalculate diversity as species richness
		D)	map nutrient levels in lakes or soils


7	One way that intermediate levels of disturbance can promote higher diversity is:
		A)	preventing colonization of exotics
		B)	preventing competitve exclusion
		C)	maintaining Hardy-Weinberg equilibrium
		D)	encouraging stability


8	Another way that intermediate levels of disturbance can promote higher diversity is:
		A)	shifting facultative mutualisms to obligate mutualisms
		B)	favoring competitive exclusion
		C)	providing opportunities to new colonists
		D)	none of the above


9	True or False: The relative abundance and diversity of species is commonly portrayed as a “life-form” curve.
		A)	True
		B)	False


10	True or False: Soil cores from tropical forests with chalk indicate past human disturbances.
		A)	True
		B)	False


11	True or False: A community with the same number of species but higher evenness will yield a higher Shannon-Wiener index value.
		A)	True
		B)	False


12	True or False: MacArthur observed that as tree foliage changed colors through the fall, the diversity of birds increased.
		A)	True
		B)	False

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