Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Quiz 6 Fall break is this weekend! Question 1 A population of turtles contained 342 individuals at the end of the year 2010. Since then, 44 have died, 37 were born, 17 immigrated, and 6 emigrated. What is the population size now? a. 298 b. 335 c. 338 d. 346 e. 353 Question 2 Although there are approximately 10,000 cheetahs left in the wild, biologists think that their numbers were much lower at some time in the past because cheetah populations have very little genetic variation. What is the most likely reason for the lack of genetic variability in cheetahs? a. Environmental stochasticity b. Demographic stochasticity c. Genetic stochasticity d. Genetic drift e. Isolation by distance Question 3 How did Brewer manipulate the level of competition in his experiment on pitcher plants? a. By adding noncarnivorous competitor species b. By weeding and clipping noncarnivorous competitor species c. By adding ants d. By removing ants e. None of the above; Brewer did not perform a manipulative study. Question 4 Black walnut trees release juglone and other chemicals that can be toxic to other plants. This phenomenon may be an example of _______, although experimental confirmation is still needed. a. isoclines b. exploitative competition c. allelopathy d. character displacement e. chthamalus Question 5 If seed-eating rodents and ants eat the same sized seeds, what would you predict? The number of rodents _______ when ants were removed and the number of ant colonies _______ when rodents were removed. a. increased; increased b. increased; decreased c. stayed the same; stayed the same d. decreased; increased e. decreased; decreased Question 6 Which of the following statements about Patterson’s study of the distributions of Neotanias chipmunks in the southwestern United States is false? a. It found that in mountain ranges where two species were present, the overlap of their distributions was small. b. It found that in mountain ranges where only one species was present, that species was found over a broader distribution of habitats than would have been possible in the presence of a competitor. c. They were manipulative experiments. d. They suggested that competition is limiting the ranges of the species. e. All of the above are true; none is false. Question 7 Suppose that two species of mice live on the same island and eat seeds, but one species tends to eat larger seeds than the other one does. Based on this observation, we can conclude that these species are engaged in a. character displacement. b. allelopathy. c. jump dispersal. d. competitive exclusion. e. resource partitioning. Question 8 Based on Paine’s studies, what has allowed the sea palm to persist in shoreline areas despite the presence of a superior competitor (Mytilus)? a. Allelopathy by the sea palm b. Character displacement c. Competitive exclusion d. Periodic disturbances e. Both a and b Question 9 Character displacement is likely to _______ the competition coefficients in two competing species and to _______ resource partitioning. a. increase; increase b. increase; lower c. increase; eliminate d. lower; increase e. lower; lower Question 10 Moths resting on the trunks of trees often resemble the tree bark such that potential predators do not perceive them as prey. This is an example of a. an induced defense. b. aposematic coloration. c. silencing. d. crypsis. e. None of the above