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	Chapter 54: Ecosystems
	Pre-Test
	Pre-Test 1 .       The energy for nearly every organism in nearly every ecosystem ultimately comes from _____. (Overview ) [Hint] 2 .       An organism's "trophic level" refers to _____. (Concept 54.1) [Hint] 3 .       Which of the following equations is correct? (Concept 54.2) [Hint] 4 .       The relationship between biomass and primary productivity is that _____. (Concept 54.2) [Hint] 5 .       Why is a diagram of energy flow from trophic level to trophic level shaped like a pyramid? (Concept 54.3) [Hint] 6 .       Consider this segment of a food web: Snails and grasshoppers eat pepper plants; spiders eat grasshoppers; shrews eat snails and spiders; owls eat shrews. The shrew occupies the trophic level(s) of _____. (Concept 54.1) [Hint] 7 .       Biogeochemical cycles are crucial to ecosystem function because _____. (Concept 54.4) [Hint] 8 .       An ecosystem is unlikely to be limited by the supply of _____ because it is obtained from the air. (Concept 54.4) [Hint] 9 .       Ospreys and other top predators in food chains are most severely affected by pesticides such as DDT because _____. (Concept 54.5) [Hint] 10 .       Which one of the following processes does not increase the concentration of greenhouse gases in the atmosphere? (Concept 54.5) [Hint] ©2005 Pearson Education, Inc., publishing as Benjamin Cummings