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EVSC100_Midterm 1.pdf

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Simon Fraser University
Environmental Science
EVSC 100
Sunny M

EVSC 100 (Surrey), Spring 2013 1 Midterm 1 Guidelines The midterm will take place during lecture hours (2:30 pm – 4:30 pm) in Room SUR 2740 on Friday, February 8 . You shall have two hours to write the midterm. The exam is closed book. You are allowed to bring your normal supply of stationary including a pen, non-programmable calculator etc. No other electronic aids, cell phones, iPod’s and other electronic gadgets are allowed. You must also bring your SFU or a government issued ID to the exam. Answer all question in pen. If you choose to write in pencil you cannot question the marking. Below is a list of five potential midterm questions. Three out of these five questions will appear on the midterm. Write complete sentences in answering the questions and cite anything you use that is not included in the lecture notes or lecture readings in APA format. There is no need to cite material from the lecture notes or readings. Include graphs and figures wherever asked and wherever you think necessary and make sure that they are properly captioned and the axis’ are properly labeled. The answer booklet has 10 pages so plan to answer all three questions within this limit. Ensure that your answers are legible. Illegible answers shall not be marked. Questions 1. The current carbon dioxide concentration in the atmosphere is approximately 394 ppm ( As the Keeling curve shows (Keeling et al., 1995), there has been a steady increase in the atmospheric carbon dioxide concentrations since the 1950’s. Critics argue that this trend is likely to persist with some models predicting CO c2ncentrations as high as 1000 ppm by 2100 (IPCC, 2001). Using this information and the current status quo answer the following questions: a. Describe the role that CO pl2ys in the atmosphere and why increasing CO levels 2re of a concern. b. List some of the factors that led to the increase in CO co2centrations over the last century and are responsible for its projected increase. c. Mention some of the strategies that could be employed to reduce CO concentr2tions in the atmosphere. 2. The carrying capacity of a certain landscape is 1500 elks. A building company is planning to construct a residential community around this landscape and have hired you as an environmental consultant to predict the possible effects of the construction on the elk community. The current size of the elk population is 1400 elks. The area of the elk habitat is 100 hectares. Post construction, this area will be reduced to 75 hectares. You can assume that the construction will reduce the quality of the grazing resources. Use your basic knowledge of population ecology and the logistic growth model to answer the following questions: EVSC 100 (Surrey), Spring 2013 2 a. Describe the logistic growth model. Provide a graph and the equation fo
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