1Biology 171 Exam 1 Winter 2009 MC ANSWER KEYS FORM 1 Multiple-choice Question Answer Key 1. E. B & D 2. B. distance from the sun 3. A. effects of Earth’s rotation 4. B. It is an example of a fixed action pattern studied by many behavioral ecologists. 5. C. Play prerecorded high-intensity bat sounds to flying moths. 6. A. λ= 25√(856/60) 7. D. They both could be right because their two hypotheses offer two complementary explanations, one proximate and the other ultimate. 8. B. local extinction of inferior competitor. 9. E. A, B & C 10. C. Keystone predators often regulate the population growth of their main prey species, but they do not affect community composition or dynamics. 11. C. Symbiosis and mutualism are synonymous and are situations where both species have increased fitness, whereas parasitism involves one species benefiting and another being harmed. 12. D. A & C 13. D. Biotic and abiotic forces interact to influence all levels of ecology. 14. A. the earth has a constant tilt with respect to the sun. 15. B. temperature and precipitation vary globally and determine the distribution of biomes. 16. C. paint the feet of some males brown and compare their mating success to that of blue-footed males. 17. E. None of the above is accurate. 18. D. Density dependence can never produce logistic population growth. 19. D. I and III only 20. B. character displacement 21. E. A & D 22. C. two species with identical niches cannot coexist. 23. C. generally able to regulate prey populations because they are usually density-dependent forces 24. E. B & C 25. A. have a cell 26. A. Connell demonstrated that biotic interactions limited the distribution of Chthamalus.27. D. Rhizobiumconverts atmospheric inorganic nitrogen into nitrate and/or ammonium for the plant and the plant provides the bacterium with sugars. 28. B. trichomes are constitutive defenses while “inhibitors” are induced defenses. 29. A. root fungi are mutualists of trees in low phosphorus soils and parasites of trees in high phosphorus soils. 30. E. B & D Short Answer Key Follows on Next Page
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