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Life in a Drop of . . .

Life in a Drop of. A Study of Succession!. Cover Page: Title and 2 Diagrams. Succession on land (text p.68) Aquatic Succession – You research! Use “pond succession” if you want to work the google on the internets machine. Purpose:

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Life in a Drop of . . .

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  1. Life in a Drop of . . . A Study of Succession!

  2. Cover Page: Title and 2 Diagrams • Succession on land (text p.68) • Aquatic Succession – You research! • Use “pond succession” if you want to work the google on the internets machine.

  3. Purpose: • The point of this lab is to study a small ecosystem and measure how organisms modify their environment. • Research: • Ecosystem - • Primary succession - • Secondary succession - • Materials: • Pasteurized milk, test tube, pH paper, wax, marker, 5 senses • Procedure: Described in slide 5 of this presentation.

  4. Milk Lab Data:

  5. Procedure - Setup: • Obtain a test tube and a marker • Place your name on the glass of the test tube • Fill almost full with pasteurized milk • Measure the pH of the milk using pH paper. Record. Throw away pH paper! • Record the appearance, smell, consistency, texture, etc. of the milk. Make many careful observations!!! • Put a piece of wax over the top of your test tube and place in the rack – throw paper away

  6. Milk pH Graph: 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 pH 10.25 10.26 10.27 10.28 10.31 11.1 11.2 11.3 Date

  7. Daily Observation – 5 minutes: • Obtain your milk – DO NOT THROW AWAY THE WAX!!!! • Record the pH • Record your observations • Place the wax back on your tube and return • Graph the pH change for today • Return to your seat

  8. Conclusion: • Answer the following in a 3 – 5 sentence paragraph each. • Describe how your milk changed in terms of appearance and consistency. • What was it that caused your milk to “sour?” Why is it bad to drink sour milk – details! • What kind of succession occurred in your Pasteurized milk? Explain how you know. • How could this experiment be made more valid? What are some sources of error?

  9. Put it all together Formal lab style • Cover sheet • Purpose • Research • Materials • Procedure • Data • Data table and graph • Conclusion

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