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

Cover Page: Title and 2 Diagrams Succession on land (text p.68) “Orca book” p.68 Miller & Levine Bio p.106 Aquatic Succession – You research! A worksheet I have—you must put the pics in order! Use “pond succession” if you want to work the googles on the internet machine. **If you use the extra-wide paper, please make sure it folds for easy transport***

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

Milk Lab Data: DatepHQualitative Observations

Procedure - Setup: 1.Obtain a test tube and a marker 2.Place team names on the glass of the test tube 3.Fill almost full with pasteurized milk 4.Measure the pH of the milk using pH paper. Record. Throw away pH paper! 5.Record the appearance, smell, consistency, texture, etc. of the milk. Make many careful observations!!! 6.Put a piece of wax over the top of your test tube and place in the rack – throw backing paper away. 7.Set up two more tubes; one identical to above and another with chocolate milk.

Milk pH Graph: 10.7 pH Date

Daily Observation – 5 minutes: 1.Obtain your milk – DO NOT THROW AWAY THE PARA-FILM! 2.Record the pH 3.Record your qualitative observations 4.Place the film back on your tube and return 5.Graph the pH change for today 6.Return to your seat

Put it all together Formal lab style Cover sheet with Title Research/Hypothesis Experiment –Equipment, materials, and procedure Data –Data table and graph Conclusion- 3 paragraphs that must address the following questions. Please number them as they are included.

Conclusion: –Why did we perform this investigation? –Describe how your milk changed in terms of appearance and consistency. –What was it that caused your milk to solidify? What caused it to smell putrid? –What kind of succession occurred in your Pasteurized milk? Explain how you know. –Compare succession in plain milk and chocolate milk. Propose reasons for differences. –How could this experiment be made more valid? What are some sources of error?