BI 102 Lab 2 Writing Assignment How did oxygen generation by Elodea vary in dark and light conditions? This assignment requires you…

BI 102 Lab 2 Writing AssignmentHow did oxygen generation by Elodea vary in dark and light conditions?This assignment requires you to evaluate a hypothesis and communicate the results of yourexperiment O2 generation by Elodea under different conditions. The questions below are meant toguide you to reporting the key findings of your experiment and help you think through how toexplain the findings and draw conclusions from them in a scientific manner. Because you’vealready had an opportunity to practice these skills once, this assignment is worth 16 points.ASSIGNMENT: Please respond to the following questions to complete your laboratory write up. For thisassignment you will only focus on O2 generation experiment. Make sure that your write up is accurate, andclearly written so that it is easily readable.A grading rubric is provided on the second page of this assignment. To earn full points on your write up,you must provide answers that align to the “meets” column of your grading rubric as well as meeting all“Quality of Writing and Mechanics” elements described in the rubric. There are also some tips on pages 3-4of this assignment to help you succeed.FORMAT:• Type your responses, using 1.5 or double spacing.• Include the section headings (Hypothesis, Results, Analysis) and question number (example: 1, 2, 3,etc) in your answers but do not rewrite the question.• Graphs may be made with a computer program (example: Microsoft excel, Mac numbers, etc) or maybe neatly produced with a ruler on graphing paper.• Print out the cover sheet on page 2 of this assignment, read and sign the academic honesty statement,and submit it with your write up. Your instructor WILL NOT accept a write up without the signed coversheet.DUE DATE: Your write up is due at the beginning of class next week. Late assignments will have 1 pointdeducted per day up to 5 days, at which point the assignment will be assigned 0 points.Hypothesis and Prediction – Part 1 of Rubric1. What did you think was going to happen in this experiment and why? You may find it helpful to state youranswers to these questions as an “if-then” hypothesis-prediction. Be sure you have included a biologicalrationale that explains WHY you made this hypothesis/prediction. Think about what is required for andwhat is produced by the process of photosynthesis.Results – Part 2 of Rubric2. How much O2 was generated by Elodea in dark and in light conditions? Answer this question by creatinga bar graph that shows the results of your experiment. If you need assistance building a graph, there is aGuide to Graphing resource available on your Moodle lab course site.Analysis- Part 3 of Rubric3. Explain why you think that the results shown in your graph support or refute your hypothesis (rememberwe never “prove” anything in science). Consider all your data and the overall data pattern as you answerthis question. Don’t ignore unusual data that may not seem to fit into a specific patterns (“outliers”).Explain what you think might be behind these unusual data points.4. What is the biological significance of your results? What biological concepts explain completely why theseevents happened in the experiment? How do these results help you understand the process ofphotosynthesis? Think about giving a specific example.References- Mechanics Checklist5. Provide at least one full citation (make sure you include an in-text citation that pinpoints where you usedthis resource) for a resource you made use of in performing the experiment, understanding the conceptsand writing this assignment. (Perhaps your lab manual? Your textbook? A website?) If you used morethan one resource, you need to cite each one! If you need help with citations, a Guide to Citing Referencesis available on your Moodle lab course site.Please print out and submit this cover sheet with your lab writeup!Lab Writeup Assignment (1) Assessment Rubric- 16 points total Name: ________________________________________Element Misses (1 point) Approaches (3 points) Meets (5 points)HypothesisClarity/SpecificityTestabilityRationale___Hypothesis is unclear and hardto-understand___Hypothesis is not testable___No biological rationale forhypothesis or rationale is fullyinaccurate___Hypothesis included is clearlystated, but not specific or lacksspecific details__Hypothesis is testable, but not in afeasible way in this lab___Some foundation for hypothesis,but based in part on biologicalinaccuracy___Hypothesis included is clearlystated and very specific___Hypothesis is testable and couldbe tested within lab parameters___Rationale for hypothesis isgrounded in accurate biologicalinformationGraphTitleAxesVariablesKeyGraph clarityData accuracy___Graph lacks a title___Axes are not labeled___Variables not addressed in graph___No key or way to tell data pointsapart___Graph is hard to read andcomparisons cannot be made:Inappropriate graph type or use ofscale___Data graphed is inaccurate ordoes not relate to experiment___Graph has a title that is not verydescriptive___Axes are either unlabeled, orunits are unclear or wrong___Variables addressed in graph, butnot on correct axes___Key included, but is hard tounderstand___Graph is somewhat readable,comparisons can be made withdifficulty: Appropriate graph type, butnot scaled well___Data graphed is partiallyaccurate; some data is missing___Graph has a concise, descriptivetitle___Axes are labeled, includingclarification of units used___Variables on correct axes___A clear, easy-to-use key to datapoints is included___Graph is clearly readable andcomparisons between treatments areeasy to make: Graph type and scaleare appropriate to data___Data graphed is accurate andincludes all relevant data, includingcontrols (if needed)AnalysisHypothesisScientific languageData addressedExplanation___Hypothesis is not addressed___Hypothesis is described usinglanguage like proven, true, or right___No explanations for data patternsobserved in graph or data does notsupport conclusions.___No biological explanation for datatrends or explanations are completelyinaccurate___Hypothesis is mentioned, but notlinked well to data___Hypothesis is not consistentlydescribed as supported or refuted___Some data considered inconclusions but other data is ignored.Any unusual “outliers” are ignored___Explanations include minimal orsome inaccurate biological concepts___Hypothesis is evaluated basedupon data___Hypothesis is consistentlydescribed as supported or refuted___All data collected is consideredand addressed by conclusions,including presence of outliers,___Explanations include relevant andaccurate biological conceptsQuality of Writing and Mechanics: Worth 1 point. Writeup should meet all of the following criteria!Yes No☐ ☐ Write up includes your name, the date, and your lab section☐ ☐ Write up is free from spelling and grammatical errors (make sure you proofread!!)☐ ☐ Write up is clear and easy-to-understand☐ ☐ Write up includes full citation for at least one reference with corresponding in-text citation☐ ☐ All portions of write up are clearly labeled, and question numbers are includedPlagiarism refers to the use of original work, ideas, or text that are not your own. This includes cut-and-paste from websites,copying directly from texts, and copying the work of others, including fellow students. Telling someone your answers to thequestions (including telling someone how to make their graph, question #2), or asking for the answers to any question, is cheating.(Asking someone how to make the graph for this assignment is NOT the same as asking for help learning excel or some othersoftware). All forms of cheating, including plagiarism and copying of work will result in an immediate zero for the exam, quiz, orassignment. In the case of copying, all parties involved in the unethical behavior will earn zeros. Cheating students will bereferred to the Student Conduct Committee for further action. You also have the right to appeal to the Student ConductCommittee.I have read and understand the plagiarism statement. ____________________________________________________SignatureGuidelines for Good Quality Scientific ReportsHypothesis and Prediction: The hypothesis is a tentative explanation for the phenomenon. Rememberthat:• A good hypothesis and prediction is testable (and should be testable under the conditions of our labenvironment; For example, if your hypothesis requires shooting a rocket into space, then its notreally testable under our laboratory conditions).• Your explanation can be ruled out through testing, or falsified.• A good hypothesis and prediction is detailed and specific in what it is testing.• A good hypothesis provides a rationale or explanation for why you think your prediction isreasonable and this rationale is based on what we know about biology.• A good prediction is specific and can be tested with a specific experiment.Examples*:I think that diet soda will float and regular soda will sink.{This hypothesis misses the goal. It is not specific as we don’t know where the sodas are floating andsinking, and it does not provide any explanation to explain why the hypothesis makes sense}Because diet soda does not contain sugar and regular soda does, the diet soda will float in a bucket ofwater, while regular soda will sink.{This hypothesis approaches the goal. It is more specific about the conditions, and it provides a partialexplanation about why the hypothesis makes sense, but the connection between sugar and sinking isunclear}If diet soda does not contain sugar, then its density (mass/volume) is lower than that of regular sodawhich does contain sugar, and so diet soda will float in a bucket of water while regular soda sinks.{This hypothesis meets the goal. It is specific and the rationale- sugar affects density and density is whatdetermines floating or sinking in water- is clearly articulated}*Note that these examples are for different experiments and investigations and NOT about yourphotosynthesis lab. They are provided only to help you think about what you need to include in your writeup.Graph: The graph is a visual representation of the data you gathered while testing your hypothesis.Remember that:• A graph needs a concise title that clearly describes the data that it is showing.• Data must be put on the correct axes of the graph. In general, the data you collected (representingwhat you are trying to find out about) goes on the vertical (Y) axis. The supporting data that thatdescribes how, when or under what conditions you collected your data goes on the horizontal (X)axis. (For this reason time nearly always goes on the X-axis).• Axes must be labeled, including the units in which data were recorded• Data points should be clearly marked and identified; a key is helpful if more than one group of datais included in the graph.• The scale of a graph is important. It should be consistent (there should be no change in the units orincrements on a single axis) and appropriate to the data you collectedExamples:{This graph misses the goal. There is no title, nor is there a key to help distinguish what the data points mean. Thescale is too large- from 0 to 100 with an increment of 50, when the maximum number in the graph is 23- and makes ithard to interpret this graph. The x-axis is labeled, but without units (the months) and the y-axis has units, but the labelis incomplete- number of what?}{This graph meets the goal. There is a descriptive title, and all of the axes are clearly labeled with units. There is a keyso that we can distinguish what each set of data points represent. The dependent variable (number of individuals) iscorrectly placed on the y-axis with the independent variable of time placed on the x-axis. The scale of 0-30 isappropriate to the data, with each line on the x-axis representing an increment of 5.}050100NumberStream locationArthropod Abundance in Oregon Streams0510152025Little Luckiamute Nestucca Neskowin RickreallTotal number of speciesStream locationArthropod Abundance in Oregon StreamsInsectsCrustaceansOther ArthropodsAnalysis: You need to evaluate your hypothesis based on the data patterns shown by your graph.Remember that:• You use data to determine support or refute your hypothesis. It is only possible to support ahypothesis, not to “prove” one (that would require testing every possible permutation andcombination of factors). Your evaluation of your hypothesis should not be contradicted by thepattern shown by your data.• Refer back to the prediction you made as part of your hypothesis and use your data to justify yourdecision to support or refute your hypothesis.• In the “if” part of your hypothesis you should have provided a rationale, or explanation for theprediction you made in your hypothesis (“then” part of hypothesis”). Use this to help you explainwhy you think you observed the specific pattern of data revealed in your graph.• You should consider all of the data you collected in examining the support (or lack of support foryour hypothesis). If there are unusual data points or “outliers” that don’t seem to fit the generalpattern in your graph, explain what you think those mean.Examples:I was right. Diet Pepsi floated and so did Apricot Nectar. Regular Pepsi sank. Obviously the regularPepsi was heavier. This helps us understand the concept of density, which is a really important one.{This analysis misses the goal. The hypothesis isn’t actually mentioned and the data is only briefly described. There isno explanation of the importance of the Apricot Nectar results. Finally, there is no connection to how these resultshelp understand density or why it is biologically important}I hypothesized that diet soda would float, and all three cans of diet Pepsi did float while the regularPepsi sank. This supports my hypothesis. Both types of Pepsi were 8.5 fluid ounces in volume, but theregular Pepsi also contained 16 grams of sugar. This means that the regular Pepsi had 16 more gramsof mass provided by the sugar in the same amount of volume. This would lead to an increase indensity, which explains why the regular soda cans sank. When we put in a can of Apricot Nectar,which had 19 grams of sugar, it floated. This was unexpected, but I think it is explained by the factthat an Apricot Nectar can had a volume of 7 fluid ounces, but the dimensions of the can are thesame as that of a Pepsi can. A same-sized can with less liquid probably has an air space that helped itfloat. The results of this experiment help us understand how the air bladder of a fish, which createsan air space inside the fish, helps it float in the water and also how seaweeds and other living thingswith air spaces or other factors that decrease their density keep from sinking to the bottom of thewater.{This analysis meets the goal. It clearly ties the hypothesis to the results and outlines what they mean. It describeshow the results support the hypothesis, but also explains a possible reason behind the unusual results of the ApricotNectar. Finally, there is a link to how this experiment helps us understand biology}emai. [email protected]

 

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