Multiple Choice Quiz


1	Which of the following is not a major subdivision of the biosphere?
		A)	hydrosphere
		B)	lithosphere
		C)	stratosphere
		D)	atmosphere


2	A/an ______ is defined as a collection of populations sharing a given habitat.
		A)	biosphere
		B)	community
		C)	biome
		D)	ecosystem


3	The quantity of available nutrients ______ from the lower levels of the energy pyramid to the higher ones.
		A)	increases
		B)	decreases
		C)	remains stable
		D)	cycles


4	Photosynthetic organisms convert the energy of ______ into chemical energy.
		A)	electrons
		B)	protons
		C)	photons
		D)	hydrogen atoms


5	Which of the following is considered a greenhouse gas?
		A)	CO2
		B)	CH4
		C)	N2O
		D)	all of these


6	The Calvin cycle operates during which part of photosynthesis?
		A)	only the light reaction
		B)	only the dark reaction
		C)	both light and dark reactions
		D)	only photosystem I


7	Root nodules contain ______, which can _______.
		A)	Azotobacter, fix N2
		B)	Nitrosomonas, nitrify NH3
		C)	rhizobia, fix N2
		D)	Bacillus, denitrify NO3


8	Which elements have an inorganic reservoir that exists primarily in sedimentary deposits?
		A)	nitrogen
		B)	phosphorus
		C)	sulfur
		D)	b and c


9	The floating assemblage of microbes, plants, and animals that drifts on or near the surface of large bodies of water is the _______ community.
		A)	abyssal
		B)	benthic
		C)	littoral
		D)	plankton


10	An oligotrophic ecosystem would be most likely to exist in a/an
		A)	ocean
		B)	high mountain lake
		C)	tropical pond
		D)	polluted river


11	Which of the following does not vary predictably with the depth of the aquatic environment?
		A)	dissolved oxygen
		B)	temperature
		C)	penetration by sunlight
		D)	salinity


12	Which of the following would be least accurate in detecting coliform bacteria in a water sample?
		A)	the presumptive MPN test
		B)	the standard plate count
		C)	the membrane filter method
		D)	the confirmatory MPN test


13	Milk is usually pasteurized by
		A)	the high-temperature short-time method
		B)	ultrapasteurization
		C)	batch method
		D)	electrical currents


14	The dried, presprouted grain that is soaked to activate enzymes for beer is
		A)	hops
		B)	malt
		C)	wort
		D)	mash


15	Substances given off by yeasts during fermentation are
		A)	alcohol
		B)	carbon dioxide
		C)	organic acids
		D)	all of these


16	Which of the following is added to facilitate milk curdling during cheese making?
		A)	lactic acid
		B)	salt
		C)	Lactobacillus
		D)	rennin


17	A food maintenance temperature that generally will prevent food poisoning is
		A)	below 4 degrees C
		B)	above 6 degrees C
		C)	room temperature
		D)	both a and b


18	Secondary metabolites of microbes are formed during the _____ phase of growth.
		A)	exponential
		B)	stationary
		C)	death
		D)	lag

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