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Snail/Elodea Lab
Cellular Respiration and Photosynthesis
Purpose: After completing this lab, students will be able to recognize the relationship between the cellular processes of photosynthesis and respiration.
Materials:
4 aquatic snails
4 sprigs of Elodea
Bromothymol blue indicator solution
8 jars with lids (~ 500 mL)
Disposable pipette
Distilled water
Procedure:
1. Number jars 1-8 and fill with room temperature water.
2. Add enough bromo blue to each bottle to obtain a green color (about 2 mL).
3. Add the following to the indicated jars:
|Bottles |Contents |
|1,5 |Sprig of Elodea |
|2,6 |Snail |
|3,7 |Spring of Elodea and Snail |
|4,8 |Nothing additional-Control |
4. Place bottles 1-4 near a light source and place bottles 5-8 in the dark (inside a drawer, for example).
5. After several hours (overnight if necessary), record your observations
Data:
|Bottle |Starting Color |Ending Color |
|1 | | |
|2 | | |
|3 | | |
|4 | | |
|5 | | |
|6 | | |
|7 | | |
|8 | | |
Analysis:
1. How did the color of each jar change?
2. Why did we put bromothymol blue indicator solution in the water of each jar?
3. What is the general chemical equation for photosynthesis?
4. What is the general chemical equation for respiration?
Conclusion: Write a paragraph explaining what happened in each of the jars and why you think those changes occurred. Include the answers to your analysis questions as an outline to your answer.
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