Lab Report Outline Yeast Culture Lab I. Introduction 1. Briefly introduce the background information of this lab. Define reproduction consumption, and death in population. Explain the main purpose of the experiment, such as what you will accomplish during the experiment and why it is important to conduct this lab. State your hypothesis of this lab. Your hypothesis must be in an if-then format and include a comparison of at least one variable to the control. Then, in one or two sentences, explain what you expect will happen, and include at least one alternative outcome 2. Il. Material and Methods 1. 2. List equipment and materials you will use. Cite any worksheets or other reference materials you use. In your own words, create a detailed and numbered list of the steps necessary to complete the experiment. Only include the steps YOU take to complete the lab assignment. You do NOT need to discuss the aspects of the actual laboratory experiment simulation, such as yeast culturing and temperatures. IlI Results 1. List any questions you have about your results 2. Make both qualitative and quantitative observations. 3. Show your work and remember to include necessary units. Include graphs, when appropriate Include tables or graphs to summarize your results, if necessary. 4. IV. Discussion Explain the shape of the population graph for each condition. Why does the graph peak 1. 2. What are the phases of the population growth cycle? How does using a simple organism 3. Describe a biogeochemical cycle that had an effect on the yeast cultures by outlining the 4. Identify and examine the food chain in a yeast community before declining? How do the limiting factors in this experiment affect carrying capacity? allow for the study of a more complex population? flow of energy in the cycle. V. Conclusion Accept or reject your hypothesis. State any discrepancies; these are problems or unpredicted events that occurred. These errors may be due to equipment or human error Based on the lab and your weekly readings, discuss the challenges of studying populations over time Make suggestions for improvement or for further research. 1. 2. 3. 4. Yeast Lab Worksheet In this lab, yeast samples were grown under four conditions: a control condition, a limited reproduction condition, an additional food condition, and an introduced predation condition. Data were collected at 0, 24, 48, 72, and 96 hours. Count the number of yeast cultures observed each time and record the data in the Yeast Lab Spreadsheet. You may need to use the zoom feature to the toolbar, number of yeast within 20 accurately count the yeast colonies. In select View> Zoom > 300%. For heavily populated squares, you may estimate the Yeast (control) Limited ReproductionAdditional Food (Sugar added) (Ammonia added) (Microbe added) 0 hours 24 hours 48 hours 72 hours 96 hours G H Yeast Culture Lab Spreadsheet 2 Use this table to record the dal au collected from the Yeast Cuture Lab Limited Reproduction Food Additional Introduced Intervals Control 5 1 (0 hours) 6 2 (24 hours) 7 3 (48 hours) 8 4 (72 hours) 9 5 (95 10 11 Yeast Population ( 1000) Predation 13 12 12 102 67 73 Yeast Population Graph 13 350 15 16 300 17 -Control 250 20 21 Limited 23 200 24 Additional Food 28 150 27 28 29 30 100 31 Predalion 33 50 35 370 38 Intervals 40 Yeast Culture Lab Spreadsheet