StudyQuestions_Week9-10

StudyQuestions_Week9-10 - Biology 180: Week 9-10 Study...

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Biology 180: Week 9-10 Study Questions Autumn 2011 Does these questions with your study group (4 people). Follow these rules: Everyone must participate in every question that you work on. Listen to each person’s contributions. At least once during each study session, each group member should (respectfully) challenge another member’s ideas. Assign roles: If your group isn’t part of a large session at CLUE or Tribeta or the IC, one person should serve as timekeeper; one as organizer (keeping people on task and getting a consensus on when to move on to the next question for discussion); one as group-dynamics checker (making sure everyone is heard); one as challenger (making sure that all ideas are carefully considered). Format: 1 Each person should write answers to the first 4 questions individually, in 20 minutes or less (these questions would be worth about 35 points on an exam). 2 Discuss each question (3 minutes each). 3 Exchange papers and use the answer key on p3 to grade each other for full credit, partial credit, or no credit (1 minute each). 4 Each member of the group should write 2 exam questions, based on key concepts from this week, identified in your weekly notes summary. Use these questions to quiz each other. 1. In Central America, an ant species lives inside the thorns of Acacia cornigera trees. A. cornigera leaves secrete a sugary solution and make protein-rich structures that the ants eat. Design an experiment to test the hypothesis that the relationship is mutualistic—specifically, that ants reduce herbivory on A. cornigera by attacking caterpillars. NOTE: the final won’t include questions on mutualism, but it will include questions on experimental design. Experimental set-up: Make and label a graph showing the results Make and label a graph showing the results predicted under the mutualism hypothesis: predicted if the relationship is actually parasitic. 2. Population dynamics equations that may be helpful: N t = N 0 λ t r = ln( λ ) ln(N t /N 0 ) = r t a. A small prairie flower is believed to be declining in abundance. In a survey of this flower species 20 years ago, 3000 individuals were found. This year, only 2300 individuals were present. Calculate λ as an annual rate, showing your work.
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b. An organization called IUCN developed criteria for listing species as critical, endangered or vulnerable. Their criteria based on population declines are as follows: Critical: >20% decline in 2 years Endangered: >5% decline in 5 years Vulnerable: >1% decline in 10 years Based on the lambda you calculated above, how would you categorize the prairie flower? Explain your reasoning or show your work. 3. Consider the population pyramids for the United States, given here. • On the 2000 data, label the area that conforms to
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StudyQuestions_Week9-10 - Biology 180: Week 9-10 Study...

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