Multiple Choice Quiz


1	Accounting for energetic needs of the producers themselves, the remaining energy is called:
		A)	secondary
		B)	net
		C)	assimilate
		D)	allocatted


2	Ecosystem function can be studied by:
		A)	accurate counts of the number of individuals within each species
		B)	following where the energy goes
		C)	focusing on consumers
		D)	assuming soil fertility is a constant


3	Trophic cascade models propose that:
		A)	feeding by top predators can change abundances of primary producers
		B)	phytoplankton will be more abundant under waterfalls because of increased dissolved oxygen
		C)	there is little interactivity across trophic levels
		D)	nutrients lost during logging operations will be recovered by freshwater invertebrates


4	Top predators in the Serengeti are:
		A)	hyenas
		B)	wildebeest
		C)	buffalo
		D)	lions


5	Energy budgets for deciduous forests show:
		A)	how little energy is used for primary production
		B)	significant losses by heat and evapotranspiration
		C)	most energy is stored as dead organic matter
		D)	all of the above


6	True or False: Since sunlight is nearly constant and infinite, ecologists believe that trophic dynamics are not presently limited by energy transfers.
		A)	True
		B)	False


7	True or False: Major plant nutrients include nitrogen, phosphorus, and potassium.
		A)	True
		B)	False


8	True or False: There is a weak correlation between primary productivity and nutirent availability.
		A)	True
		B)	False


9	True or False: There is a strong positive linear relationship between algal biomass and rate of primary production in temperate zone lakes.
		A)	True
		B)	False


10	True or False: In American grasslands, there is an apparent north-south trend in rainfall amount that offsets an east-west trend in productivity.
		A)	True
		B)	False


11	True or False: Isotopic ratios are useful because some organisms fractionate different isotopes.
		A)	True
		B)	False

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