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Review_questions_Exam1_las - Review for Exam I PCB 4043...

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Review for Exam I PCB 4043 - Spring 2010 These questions are meant to 1) give you an idea of the style of exam questions you might expect from us and 2) highlight some of the concepts we feel are most important. These review questions are by no means inclusive of everything that will be on the exam but we highly recommend using them in your studying. Please email and/or schedule office hours with us if you have questions. At first, the number of questions may seem overwhelming. However, if you have been attending the lectures, reviewing the powerpoints and reading the book, you should be able to answer them quickly. If you are having trouble answering these questions, use this as a constructive indicator that you might have a fair amount of work to do before the exam. Answers are due on Thursday, 25 February before 11am and will count as one homework assignment. To limit the pages you need to print, you can create a separate document with just your answers. Some answers require sketching diagrams or graphs, which can be done using Word or you can just draw by hand. This homework assignment will be graded as pass/fail and will not be returned. Questions from Laura ---- Scientific method and experimental design 1) Think about the following observations and questions: A naturalist notices that some white oak leaves are partially eaten by caterpillars. The naturalist then wonders, why aren’t more of the leaves being eaten? She then sees a bird swop down and eat a caterpillar. Provide a hypothesis that also includes a prediction about a possible causal factor. 2) We discussed four sets of research approaches: Basic v applied; Theoretical v Empirical; Correlation v Experimental. Consider these four groups of approaches for the following questions. a) A researcher is studying how freshwater invertebrates respond to increases in water temperature in an attempt to make predictions about future effects of climate change. They set up microcosms that are set at three different temperatures, add invertebrates and monitor 1
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responses. Is this experiment basic or applied? Is it more theoretical or empirical? Is it best described as a natural correlation or experimental approach? b) A researcher is studying phosphorus cycling in a wetland. Their study involves sampling 15 different tropical and subtropical wetlands. They collect data from these wetlands and look for trends between variables such as pH, rates of litter turnover and redox conditions. Is this study theoretical or empirical? Does it appear to use a correlation or experimental approach? c) One of the interests of H.T. Odum was to better understand energy flow through ecosystems. In one of his studies on this topic, he uses models to compare Ohm’s Law in physics to energy flow in ecosystems.
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