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RU BL 262 - Examination

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BIOLOGY 262, FALL 2002 EXAMINATION #1 (PART 1) - KEY Name Date MULTIPLE CHOICE.For the following multiple choice questions circle the letter in front of the response that best answers the question or completes the sentence. (20%, 2% each) 1. Which of the following is FALSE about science? a. It is a philosophy. b. It is a way to know objective reality exactly. c. It requires an assumption of order in the universe. d. It requires empirical evidence. e. None of the above. (All are true) 2. Which of the following BEST explains why photosynthesis in the open ocean is limited? a. Currents move photosynthesizers. b. Human fishing activities. c. Nutrients sink into deep water. d. The ocean is cool or cold. e. There are few places for photosynthesizers to “root.” 3. Which of the following best describes your ecological relationship to a peanut as you eat it? a. Commensalist b. Ectoparasite c. Grazer d. Parasitoid e. Predator 4. Why is it warmer nearer the equator? a. The equator is closer to the sun. b. The equator receives more direct sunlight. c. The earth spins on its axis. d. Warm air rises at the equator. e. None of the above 5. Which of the following islands should theoretically have the most species? a. Large island far from continent. b. Large island near continent. c. Small island far from continent. d. Small island near continent. 6. Currently, what is the most-significant cause of species becoming endangered? a. Commercial overexploitation b. Effects of exotic organism c. Habitat alteration (destruction) d. Recreational disturbance & overexploitation e. None of the above 7. In which of the following regions would you expect to have the most species? a. Central Alaska. b. Kenai Peninsula in Alaska. c. Kodiak Island off Alaska. d. South central México. e. Cozumel Island off the Yucatan. 8. If a population of 10,000 is undergoing exponential growth with a yearly intrinsic rate of increase of 0.01, then what is the size of the population after 2 years? a. 10,100 b. 10,200 c. 11,000 d. 22,000 e. None of the above (= 10,201) 9. Which of the following explains how Balanus barnacles exclude Cthalamus barnacles from lower intertidal areas? a. Exploitative competition. b. Interference competition. c. Parasitoidism by Balanus. d. Predation by Balanus. e. Balanus do not exclude Cthalamus. 10. The population of western tent caterpillars described in the textbook “crashed” due to… a. competition with ants. b. decline in nutrient quality of food. c. microparasite infection. d. parasitoidism by small wasps. e. None of the aboveMATCHING.For the following exercise match the cost/benefit symbols in the right column with the corresponding community interaction in the left column. Each letter may be used more than once or not at all. (10%, 2% each)1. Amensalism E 2. Commensalism B 3. Cows grazing on grass C 4. Humans and our colon bacteria A 5. Müllerian mimicry in bees & wasps A A. (+ +) B. (+ 0) C. (+ -) D. (- -) E. (- 0) FILL-IN-THE-BLANK.For the following exercises write the appropriate word or words in the available space.(20%) 1. Sketch and correctly label a typical ENERGY pyramid for an ecosystem. Include the names of at least 3 trophic levels. (4%) 2. Fill in the lines on the biogeographic graphs below. (3%) local # extinction species rate island size island size 3. Mark in 15 squares on the grid below. The squares marked represent cattle pasture created from uniform tropical forest. Place your squares to maintain the highest species richness in the remaining forest. (3%) 4. Fill in the survivorship column in the life table below for a cohort of ducks. (4%) Age Number Survivorship 0 2000 1.000 1 200 0.100 2 100 0.050 3 90 0.045 5. Use the data in the table in #4 above to complete the survivorship line graph below. (2%) survivor- ship Age 6. What type of survivorship does the cohort of ducks in #4 & 5 exhibit. (2%) Type III 7. What characteristic of microparasites often results in disease and death of the host. (This characteristic is absent in most macro-parasites.) (2%) Can reproduce in the host. 0.501.000.0002 3 1 Primary Producers Herbivores (1° Consumers) 1° Carnivores (2° Consumers) A compact un-fragmented forest.BIOLOGY 262, FALL 2002 EXAMINATION #1 (PART 2) - KEY Name Date DEFINITIONS.For the following BIOLOGICAL words or phrases define them as accurately and concisely as possible. (20%, 4%) 1. Science: A belief that natural phenomena have natural causes that can be revealed by empirical evidence. 2. Edge Effect: A region of a habitat patch affected by the adjacent habitat. 3. Endemic: A species or group of species found in only one place. 4. Primary Production: Production of biologically useful energy by using sunlight (or by using some other kind of non-biological energy source). 5. (Subpopulation) Rescue Effect: The maintenance of a sink population by emigration from a source population SHORT ANSWER/PROBLEMS. Address each question in as concise and lucid a manner as possible. (10%) 1. A population of 10,000 rabbits is growing logistically and has a yearly intrinsic rate of increase of 0.2. The carrying capacity is 100,000. What is the size of this population after one year? After two years? (Be sure to write down any equations you used.) (6%) ∆N/∆t = rmaxN [(K-N)/K] ∆N/∆t year 1 = 0.2 (10,000) [(100,000-10,000)/ 100,000] = 1800 1800 + 10,000 = 11,800 – population after 1 year∆N/∆t year 1 = 0.2 (11,800) [(100,000-11,800)/ 100,000] = 2081.52 2081.52 + 11,800 = 13,881.52 (or 13,882) – population after 2 years 2. Briefly explain how plants benefit from producing aspirin, caffeine, nicotine, LSD, and a wide range of other chemical compounds that are not involved in the growth, reproduction, or maintenance of the plant but do alter the physiology of animals. (4%) Plants produce these substances as secondary compounds to deter their grazers and predators. Many of these substances are acute toxins that have adverse effects upon insect physiology (i.e., many act as “bug” killers).SHORT ESSAYS.For the following essays, address each question in as concise and lucid a manner as possible. Do NOT exceed the space provided. (20%) 1. Two bacteria, Yersina pestis, the black plague bacterium, and Mycobacterium tuberculosis, the tuberculosis bacterium, killed many


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