Name: ________________________________________________________ Date: ______________ Period: _______ Virtual Population Lab Activity Go to the following website or use my link on my website to complete the virtual lab activity. http://glencoe.mcgraw‐hill.com/sites/dl/free/0078759864/383928/BL_04.html Read through the lab’s directions on the left hand column: 1. What is the purpose of this virtual lab? ______________________________________________________________________________________________________________ 2. Summarize the 2 objectives. a. _______________________________________________________________________________________________________ b.
_______________________________________________________________________________________________________ Read the Procedures on the left. 3. What will the Paramecia feed on while in the test tubes? _______________________________________________________________ 4. Fill test tube 1 with 10ml of Paramecium caudatum. 5. Fill test tube 2 with 10ml of Paramecium aurelia. 6. Fill test tube 3 with 5ml of Paramecium caudatum and 5ml of Paramecium aurelia. 7. Click the microscope to analyze your three samples. 8. Click CLEAN MICROSCOPE SLIDES….and then click TAKE SAMPLE. 9. Drag sample 1 to the microscope. Have one partner count the number of cells, then the other count them again for accuracy. Fill in the data table. Do the same for sample 2 and sample 3. a. Notice the differences between the two species of Paramecium, as this is important to differentiate between the two. b. To make counting easier click “GRID ON” on the base of the microscope. c. You can click right on the mouse to ZOOM in on the Paramecium that you are counting. 10. When finished, click CLEAR SLIDES and then click the calendar to change the day. 11. Repeat steps 8‐10 until you have counted a total of 16 days. Data: P. caudatum only P. aurelia only
Only Only (test tube 1) (test tube 2) P. caudatum when P. aurelia when Drawing of mixed together mixed together Paramecium (tube 3) (tube 3) Day 0 Day 2 Day 4 Day 6 Day 8 Day 10 Day 12 Day 14 Day 16 Click INFORMATION to read about the two types of microorganisms. 12. Where do Paramecia normally live? _________________________________________________________________________________ 13. What is exponential growth? ______________________________________________________________________________________ ______________________________________________________________________________________________________________ 14. What often prevents populations from growing exponentially? ___________________________________________________________ 15. What is a carrying capacity? _______________________________________________________________________________________ ______________________________________________________________________________________________________________ 16. Besides the answer to #14, what else can limit populations from growing? _________________________________________________ 17. What is the principle of competitive exclusion? _______________________________________________________________________ ______________________________________________________________________________________________________________ 18. Why will some organisms move to unoccupied areas? __________________________________________________________________ Graph: 19. Create a graph of the mixed Paramecia (test tube 3) to show your results using the proper graphing components: Analysis: 20. When grown separately: a.
On which day did the Paramecium caudatumpopulation (test tube 1) reach the carrying capacity? ______________________ b.
On which day did the Paramecium aureliapopulation (test tube 2) reach the carrying capacity? _________________________ 21. When grown together (in test tube 3): a.
On which day did the Paramecium caudatum population reach the carrying capacity? _________________________________ b.
On which day did the Paramecium aurelia population reach the carrying capacity? ___________________________________ 22. Why do you think the carrying capacity for Paramecium caudatum changed so drastically when mixed with Paramecium aurelia? ______________________________________________________________________________________________________________
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______________________________________________________________________________________________________________ 23. Describe what happened when the Paramecium populations were mixed in the same test tube. Refer to your data. ______________________________________________________________________________________________________________
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______________________________________________________________________________________________________________ 24. Do the results support the principle of competitive exclusion? Refer to your data to explain why or why not. ______________________________________________________________________________________________________________
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