EXAM+4+2005 - Biology 1720, Fourth Non-Comprehensive Exam,...

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Biology 1720, Fourth Non-Comprehensive Exam, 2005 1. Which of the following is NOT a factor in the opening of the stomata? a. a decrease in turgor pressure in the guard cells b. movement of potassium ions (K + ) into the guard cells c. light d. the influx of water e. expansion of the guard cell walls 2. The phytochrome system activates certain plant growth responses, such as germination, when a. Pr is rapidly converted to Pfr b. Pfr is rapidly converted to Pr c. Pr and Pfr are equally stimulated by far-red and red light, respectively d. far-red light is absorbed by Pfr e. photosynthetic production of ATP powers phytochrome conversion 3. Which of the following is best described as an innate behavior? a. You associate boiling water with pasta and start salivating b. You touch a pot of boiling water, jerk your hand away quickly and shout an exclamation c. You previously touched a pot of boiling water, and you are not about to do it again d. While reaching out to touch a pot of boiling water, someone shows you a queen-of-hearts playing card and you assassinate a prominent political figure e. You have never seen a pot of boiling water before, but after some consideration, you pick it up with oven mitts 4. If one species of forest bird is territorial and a second lives in flocks, what population distributions would you expect to see? a. Logistic and clumped, respectively b. Uniform and logistic, respectively c. Uniform and random, respectively d. Logistic and random, respectively e. Uniform and clumped, respectively 5. An organism’s niche can be described in terms of a. conditions appropriate for mating b. the temperature range in the environment c. its interactions with other organisms d. a) and c) are correct e. a, b, and c are correct 6. Food chains are usually short because a. only a single species of herbivore feeds on each plant species b. local extinction of a species causes extinction of the other species in its food chain c. most energy in a trophic level is lost as it passes to the next higher level d. predator species tend to be less diverse and less abundant than prey species e. most producers are not edible 7. Guttation results from a. the pressure flow of sap through the phloem b. a break in the water column of the xylem sap, resulting in an air space c. the rate of water uptake from the soil exceeding the transpiration rate d. a higher water potential in the leaves than in the roots e. high humidity following rainfall 8. Which of the following plant hormones is INCORRECTLY paired with its function? a. auxin – promotes stem growth through cell elongation b. cytokinin – initiates leaf senescence (aging and dying) c. gibberellin – stimulates seed and bud germination d. abscisic acid – promotes seed and bud dormancy e. ethylene – promotes leaf abscission (separation from the plant) 9. Detritovores are essential to sustaining an ecosystem because they a. they get rid of rotting organisms that would otherwise cause disease b. promote the cycling of water, nitrogen, and phosphorous
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EXAM+4+2005 - Biology 1720, Fourth Non-Comprehensive Exam,...

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