Multiple Choice Quiz


1	The percentage of earth’s water that is freshwater is:
		A)	3
		B)	29
		C)	71
		D)	97


2	A gyre is:
		A)	a fertile zone in the open ocean
		B)	the zone where warm and cold layers of water mix
		C)	a genus of abyssal zone fish utilizing bioluminescence
		D)	an ocean circulation


3	Threats to oceanic biodiversity include:
		A)	human harvests of zooplankton
		B)	nuclear waste
		C)	endemic phyla
		D)	a and c, but not b
		E)	a and b, but not c


4	Darwin observed that a key step in atoll formation was:
		A)	barrier reef subsidence
		B)	erosion of granitic boulders
		C)	colonization of volcanic shoulders
		D)	none of the above


5	A repeat of high and low tides each day is called:
		A)	bimodal
		B)	diurnal
		C)	semi-neapal
		D)	colloidal


6	Intertidal zones are characterized by:
		A)	variable temperature
		B)	constant salinity
		C)	a limited distribution of oxygen
		D)	uniform species distribution


7	That ice is less dense than water at freezing:
		A)	allows deep lakes to avoid winterkills of fish
		B)	underscores the importance of wind currents
		C)	prevents thermal stratification
		D)	none of the above


8	True or False: Lakes are more variable in their salinity than oceans.
		A)	True
		B)	False


9	True or False: Karr’s index is a three-part assessment of intertidal zone biodiversity.
		A)	True
		B)	False


10	True or False: Human-caused introductions have dramatically changed the ecology of the Great Lakes.
		A)	True
		B)	False


11	True or False: Eutrophic lakes support oxygen-demanding fish such as trout.
		A)	True
		B)	False


12	True or False: The river continuum concept suggests that terrestrial inputs are very important to the functioning of stream ecosystems.
		A)	True
		B)	False


13	True or False: Salt marshes support high levels of species diversity.
		A)	True
		B)	False

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