Exam 2 - Regis

More documents

Recommendations

Info

6-7. Refer to the following two graphs. Seedlings of an annual plant were split into two equal treatment groups; in one group, extra fertilizer was provided, and in the other group (the control group), no additional fertilizer was added. The numbers of seeds and the average weight of the seeds from each individual plant were monitored, and these data were plotted (each point represents an individual plant). The first graph represents the number of seeds (x-axis) and the weights of those seeds (in micrograms) (y-axis) from the control group. The second graph represents the number of seeds (x-axis) and the weights of those seeds (in micrograms) (y-axis) from the with fertilizer group. 6. According to the graphs, fertilizer treatment _______ seed size and _______ seed number. a. increased; had no effect on b. increased; increased c. had no effect on; decreased d. had no effect on; increased e. decreased; increased 7. Which of the following statements best describes the results of this study? a. Trade-offs between seed size and seed number existed in both the control and the fertilizer groups, and these trade-offs were of roughly equal magnitude. b. Trade-offs between seed size and seed number existed in both the control and the fertilizer groups, but these trade-offs were much larger in the fertilizer group. c. A trade-off between seed size and seed number existed in the control group but not in the fertilizer group. d. A trade-off between seed size and seed number existed in the fertilizer group but not in the control group. e. Neither the fertilizer group nor the control group showed a trade-off between seed size and seed number. 8. If the population density of ocotillo in a desert is 15 per square kilometer, how many plants would be expected in an area that is 5 km by 3 km? a. 15 b. 45 c. 150 d. 225 e. 1,500 2
9. An evolutionary ecologist is interested in studying the evolutionary change over the course of many years in populations of lizards that reproduce via parthenogenesis. Which type of individual would be the most appropriate focus of the study? a. Genet b. Ramet c. Opuntia d. Both a and b e. ghost 10. Area-based methods often make use of sampling areas of a defined size called a. transects. b. quadrats. c. mark and recapture. d. ramets. e. cemetaries. 11. Which of the following statements about population growth is true? a. Exponential population growth is always faster than geometric population growth. b. We use the term “exponential growth” when the individuals in the population reproduce in synchrony at discrete individuals. c. A population that has a of 0.88 should grow in size. d. All of the above e. None of the above 12. Which of the following would not be an example of density-dependent factors regulating population size? a. The number of possible territories for robins is limited; thus when population sizes are high, a lower proportion of individuals can produce offspring. b. In conditions of overcrowding, some desert pupfish living in ponds will emigrate to other ponds if given the opportunity. c. In conditions of high density, mice are more susceptible to mortality from heat stress. d. Predation on mosquitofish is high, regardless of population size. e. All of the above are examples of density-dependent factors regulating population size. 13. Which of the following statements about logistic growth is true? a. The carrying capacity is the maximum population size that can be supported by the environment indefinitely. b. At low densities, logistic growth is similar to exponential growth. c. At the carrying capacity, there is no population growth in the logistic model. d. All of the above e. None of the above 14. As of 2010, the human population was just under a. 7 billion. b. 700 million. c. 3 billion. d. 17 billion. e. 30 billion, but most are zombies. 3
Page 1: Principles of Ecology BL / ENVS 402
Page 5 and 6: 21. Many species of butterflies are
Page 7 and 8: Part Three: Longer-answer questions

Exam 2 - Regis

Create successful ePaper yourself

Delete template?

Save as template?