Your last name 1 Name: ________________________ Teacher’s Name: ________________ Class: ________________________ Date: ________________________ TITLE How To Use This Lab Skeleton: The instructions are in ORANGE. The content is in BLACK. Take out the orange and type in your responses in black. You are finished when no ORANGE remains! (change this to an original title that sums up the lab) Prelab Information: This lab activity contains three kinds of sponge animals (octopus, lobster, seahorse). The question is, “Do all three types of animals take the same amount of time to emerge from their capsules?” Formally, the hypothesis you are testing is called “the null hypothesis,” abbreviated as H0. For this experiment, our null hypothesis is: All three kinds of sponge animals will take the same amount of time to emerge from their capsules. Although it may seem odd to begin an experiment by assuming that essentially nothing interesting will happen (i.e., that the animals will not take different amounts of time to emerge), biologists and other research scientists always phrase their question in this way. Only if we reject the null hypothesis do we then conclude that other, often more interesting alternatives may be true. PURPOSE: The purpose is the reason why the lab is being done. You type the purpose of the lab (in your own words) here. HYPOTHESIS: You type your hypothesis here. A hypothesis is a testable statement about what you think is going to happen when the experiment is performed. It should include both a guess AND a reason why you think that guess is correct. MATERIALS: You add a list of what you used. PROCEDURE: Your last name 2 1. 2. 3. 4. 5. Measure (in millimeters) and weigh (in grams) the capsule that you are given. Record the capsule’s color. The instructor will provide you with some warm water. Record the temperature of this water (in degrees Celsius) and then obtain 25ml (into a 250ml beaker) for your group. Drop your capsule into the water and record the time. Begin stirring using the plastic stirrer. Record any observations and notes as the experiment progresses. When your animal emerges from the capsule, note the time. Determine how long it took for the sponge animal to emerge. Note the type of sponge animal that you received. Note this in the appropriate data section. Obtain data from other groups in the classroom. DATA: Neatly type in your raw data here. Pay attention to significant figures and units: Color of capsule: ____________________________________________ Capsule length: _____________________________________________ Capsule width: _____________________________________________ Capsule weight: _____________________________________________ Initial water temperature: ____________________________________ Time at which the capsule was put into the water: __________________ Time at which the sponge animal emerged: ________________________ Type of animal that emerged: _________________________________ Observations and notes: _____________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ Your last name 3 Class Data Table Type of Animal Group Time to Emergence (minutes:seconds) Time to Emergence (seconds) Your last name 4 For a visual representation, you will always want to graph your data. Pay attention to where the independent and dependent variables go. Figure 1: Title (look back in your “How To Make A Graph” notes to see how to write a good title for a graph) Your last name 5 Using your answers to these questions write a Conclusion Paragraph. To get full credit, your interesting and well-written paragraph should contain answers to all of the questions below. Conclusion/Analysis Questions: 1. Did all capsules successfully release sponges? 2. Did the class all get the same number of each kind of animal, or were there more of one kind than another? 3. Did all three types of sponge animal take the same amount of time to emerge from their capsules? 4. Did animals of any one kind always take the same amount of time to emerge from their capsules? 5. How long did it take the average octopus (or lobster or seahorse) to emerge from the capsule? 6. Is the null hypothesis supported or rejected? 7. Could there be any improvements made in this experiment for the future? CONCLUSION: After you have finished writing the Conclusion, go back and write the Title. The Title should be a short statement that sums up what the entire lab was about. Be creative! The only title you can’t use, is the one your teacher is using! Last-minute check! Did you use the spellchecking feature to make sure your words are spelled correctly? Are you going to make sure your lab report prints neatly and is stapled in the upper-left hand corner?