FINAL EXAM Spring 2007 Form A - KEY

FINAL EXAM Spring 2007 Form A - KEY - Questions 1-21 are...

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Questions 1-21 are from the last ¼ of the course ------------------------------------------------------------------------------------------------------- Questions 1-3 use the following information: Some tropical trees produce extrafloral nectaries. Extrafloral nectaries are small glands on the leaves of the tree that secrete sugary (high carbohydrate) substances. These nectaries attract ants, which feed upon the sugar rewards. 1. A biologist states “Trees with extrafloral nectaries attract ants that protect the tree from herbivores”. This statement is a (an): a. prediction *b. hypothesis c. test d. result e. conclusion 2. The biologist then states "If trees with extrafloral nectaries attract ants that protect the tree from herbivores then trees without nectaries should have higher herbivory than trees with extrafloral nectaries". This statement is a (an): *a. prediction b. hypothesis c. test d. result e. conclusion The biologist then conducts an experiment. She removes nectaries from 10 trees while leaving nectaries intact on 10 other trees. After one year, she then measures percent of leaves damaged by herbivores. Her results are as follows: 0 20 40 60 80 100 With Nectaries Without Nectaries 3. What is the best conclusion from these results? a. trees with and without nectaries differ significantly in amount of leaf damage b. ants are attracted to trees with nectaries c. trees and ants are mutualists because both benefit in terms of fitness from the interaction *d. the hypothesis that ant protect trees with extrafloral nectaries is not supported e. the trees are cheating the ants, and thus are acting as parasites of the ants ----------------------------------------------------------------------------------------------------------- - 1 % leaves eaten by herbivores
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14. A biologist suspects that jaguars (big cats) in Florida are keystone predators. Jaguars feed on various small mammals, which in turn, feed on plants, seeds, and various insects. The biologist compares areas of the Florida everglades where jaguars are present and another area where they are not. Which of the following evidence would support his hypothesis that jaguars are keystone predators (hint: recall the Pisaster intertidal experiment): a. rodent species numbers are greater in the area without jaguars b. plant and insect diversity are similar in areas with and without jaguars *c. species diversity of rodents, plants and insects is much greater in the area with jaguars than the area without jaguars d. numbers (density) of other predatory mammals is greater in the area with jaguars than the area without jaguars e. overall species diversity is equivalent in the area with and without jaguars 5. Long-term fur records from the Hudson Bay Company show that hares and lynxes oscillate in fairly regular 9-11 year cycles. More recent field experiments where food quantity, food quality or predatory lynxes are manipulated and compared to control (no manipulation) show: a. lynx predation solely determine hare densities
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This note was uploaded on 04/02/2008 for the course BIO 187 taught by Professor Douglasgreen during the Spring '07 term at ASU.

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FINAL EXAM Spring 2007 Form A - KEY - Questions 1-21 are...

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