BIOB50, Fall 2023 - PracticeExam 1, MC_AnswerKey.pdf

Page 1 of 12 P RACTICE E XAM 1, M ULTIPLE C HOICE S ECTION – BIOB50H3F, F ALL 2023 E XAM L ENGTH : T he total exam length is 2 hours. Assuming you will spend about 20 minutes on a short answer question, you should plan to finish all multiple choice questions approximately within 1h 40 minutes. There are 24 multiple choice questions. P ERMITTED A IDS : B asic calculator. The calculator must not be able to memorize text or mathematical formulae.

Page 2 of 12 1. An alternative hypothesis is a: a. proposed explanation where the extraneous factors do not have an effect that accounts for the observed pattern or process b. proposed explanation where the focal factors do not have an effect that accounts for the observed pattern or process c. proposed explanation where the extraneous factors do have an effect that accounts for the observed pattern or process d. proposed explanation where the focal factors do have an effect that accounts for the observed pattern or process 2. The shown conceptual model explains that: a. Increasing predator numbers will lead to increasing prey numbers; increasing prey numbers will lead to increasing predator numbers b. Increasing predator numbers will lead to decreasing prey numbers; increasing prey numbers will lead to increasing predator numbers c. Increasing predator numbers will lead to increasing prey numbers; increasing prey numbers will lead to decreasing predator numbers d. Increasing predator numbers will lead to decreasing prey numbers; increasing prey numbers will lead to decreasing predator numbers

Page 3 of 12 3. A group of individuals who successfully interbreed are considered the same ______. They are considered to be in the same ________ if they live and interact with one another in a particular area. a. species; community b. population; community c. community; population d. species; population 4. Which of the following statements about solar radiation is part of our conceptual climate model? a. The Earth’s axis was titled in the past but isn’t anymore. b. Higher latitudes receive the most amount of solar radiation when averaged over the year c. The North and the South Pole receive the same amount of solar radiation during winter solstice d. The same location on Earth will receive varying amounts of solar radiation during the year due to Earth’s rotation a round the sun 5. Scientists define biomes based on the dominant ____ community a. plant b. animal c. vertebrate d. soil 6. The main difference between a temperate forest and a boreal forest is that: a. a temperate forest has lower tree diversity than a boreal forest. b. a temperate forest has a shorter growing season than a boreal forest. c. a boreal forest has more extreme temperature variation than a temperate forest. d. a temperate forest will see its soils freeze and form permafrost, whereas a boreal forest’s soil does not freeze. e. a temperate forest will be composed predominantly of coniferous trees, whereas the predominant trees in a boreal forest will be deciduous trees.

Page 4 of 12 7. This graph shows the abundance of a species as a function of temperature. R 0 equals 1 at the temperatures that are marked T L and T H . At which temperature(s) does R 0 equal 2? a. There is not enough information to answer this question. b. At the two temperatures marked A. c. At the two temperatures marked B d. At the temperature marked C

Page 5 of 12 8. The figure below shows a hypothetical temperature gradient from the equator to the north pole (panel a) before and after climate warming. Panel (b) shows the R 0 at each location from the equator to the pole as determined by the temperature at that location, also before and after climate warming. Assume that there are no biotic interactions limiting the species’ range, so that it fully occupies its fundamental niche. Extinction debt is said to occur in those regions where the species can currently persist but will go extinct with warming. Colonization credit is said to occur in those regions where the species could not persist before climate warming, but where it may persist after warming if it colonizes. Which areas have an extinction debt, and which have a colonization credit? a. Extinction debt: A; colonization credit: B b. Extinction debt: C; colonization credit: D c. Extinction debt: A; colonization credit: D d. Extinction debt: C; colonization credit: B

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