Midterm Fall 2007


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1 TROPICAL ECOLOGY/THE NATURE OF TROPICAL FORESTS MIDTERM Fall 2007 Prof. Arthur C. Gibson INSTRUCTIONS: PRINT your name clearly on the answer sheet. Be sure that question number corresponds to the number of the answer sheet. If you do not understand a question, ask now. Be sure to answer all questions, because there is no penalty for guessing. Turn in the answer sheet; keep the exam questions. The answer key for the exam will be posted before dinnertime today on the course website. MULTIPLE CHOICE. Items 1 45 on the Answer Sheet. 2.9 points each. Notice that some of the questions are written in a negative format. The responses of each question are listed in alphabetical order. Select the one best answer for each. 1. Animals classified in family Dendrobatidae: (a) are avoided by predators because they have painful stingers on the abdomen; (b) are predators active generally at nighttime, because they are too easy to spot during daylight; (c) spend most of their lives living on green leaves in the canopy, because these are tree frogs; (d) typically specialize in eating ants; (e) a and c. 2. Müllerian bodies are: (a) food rewards for ants on acacia leaves; (b) fruiting structures of special tropical mycorrhizal fungi; (c) lipid-containing attachments on seeds being dispersed by ants; (d) the hardened outer wing covers of beetles; (e) tiny structures rich in glycogen and lipids produced at the bases of Cecropia leaves. 3. Choose from this list countries or a region belonging to the Neotropics: (a) Colombia and Venezuela; (b) continental United States; (c) Indonesia; (d) New Guinea and Queensland; (e) the Congo. 4. Deciduous tropical forests are found: (a) in climatic zones where there is enough rainfall to support tree growth but having a long dry season during which the trees are leafless; (b) the area receives fog cover virtually every morning but cloudless conditions every afternoon; (c) typically on the drier margin of semi-evergreen lowland rain forest; (d) b and c; (e) a and c.
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2 5. This plant lifeform is a woody climber, with some of its roots always anchored in the soil: (a) epiphyte; (b) hemiparasite; (c) liana; (d) parasite; (e) trichilium. 6. Leaf-cutter ants of the genus Atta : (a) cultivate a fungus for the nutritious gongylidia, which are eaten by all ants of the colony but are absolutely required by the young; (b) have a biotic interdependence with a particular species of fungi, so that neither can exist without the other; (c) use leaves of any and all plant species in the forest, because any leaf is equally good for growing the fungus; (d) a and b; (e) a, b, and c. 7. Nitrogen-fixing bacteria can convert N N into ammonia: (a) as the bacteria decompose leaf litter on the rainforest floor; (b) living in thin-walled root cells under anaerobic conditions; (c) when engaged in a symbiotic relationship with palm roots; (d) when they become attached to the hyphae of a mycorrhizal mat; (e) b and c. 8.
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This note was uploaded on 04/12/2011 for the course EEB 151A taught by Professor Gibson during the Winter '11 term at UCLA.

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