Review the image(s) and answer the following questions.

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1			Where is the major reservoir for the water cycle?
			A)	glacial ice
			B)	atmospheric water vapor
			C)	oceans
			D)	bodies of freshwater
2			What two factors regulate rainfall?
			A)	transpiration and evaporation
			B)	evaporation and condensation
			C)	transpiration and condensation
			D)	The location determines which of these pairs of factors is most important.

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3			Where is the major reservoir for the earth's carbon cycle?
			A)	plant biomass
			B)	bicarbonates in water
			C)	carbonates in sediment
			D)	atmospheric carbon dioxide
4			What is the carbon cycle most closely linked to within communities of organisms?
			A)	the food chain
			B)	the hydrologic cycle
			C)	the sulfur cycle
			D)	the nitrogen cycle

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5			What group of organisms plays a critical role in delivering nitrogen to plants?
			A)	ammonifying bacteria
			B)	nitrogen-fixing bacteria
			C)	birds
			D)	defecating herbivores and carnivores
6			What group of organisms plays a global role in returning nitrogen to the atmosphere?
			A)	nitrogen-fixing bacteria
			B)	ammonifying bacteria
			C)	nitrifying bacteria
			D)	denitrifying bacteria

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7			How much of the sunlight energy that reaches the earth is incorporated into plant biomass through the process of photosynthesis?
			A)	less than 1%
			B)	about 5%
			C)	10-15%
			D)	over 40%
8			Approximately how much energy is lost as heat when moving from one trophic level to the next?
			A)	10%
			B)	25%
			C)	50%
			D)	90%

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9			What is another name for the herbivore at trophic level 2?
			A)	producer
			B)	primary consumer
			C)	secondary consumer
			D)	tertiary consumer
10			The top carnivore would also be considered as which of these?
			A)	producer
			B)	primary consumer
			C)	secondary consumer
			D)	tertiary consumer

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11			What does this diagram indicate about the energy relationships within the food web of Cayuga Lake?
			A)	There are many more algae and cyanobacteria than there are smelt and trout.
			B)	There is a loss of energy at each succeeding trophic level.
			C)	It is energetically less expensive for humans to consume smelt than trout.
			D)	All of these are correct.
12			Do stream food webs follow the same relationship shown here?
			A)	Stream food webs are often dependent on inputs of organic matter from the watershed, such as materials from trees.
			B)	Stream food webs have fewer links than that shown for Cayuga Lake.
			C)	Stream food webs do not contain algae and cyanobacteria, so they are not the same as that for Cayuga Lake.
			D)	Stream food webs are virtually identical to the one shown here, although the types of organisms may vary.