Student Exploration: Plants and Snails Part 2 (Answer Key)

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Question: How are the amounts of oxygen and carbon dioxide related to each other?
  1. Observe: Put two Elodea sprigs into a test tube. Put the O2/CO2 probe into the tube with the Elodea. Click Play. As the Gizmo runs, Pause () it about every 2 hours (as close as you can). Record your results below including units
Graph your results below. Include units and label the axis. (you can use separate graph paper and turn that in if that is easier)             
A.How do the oxygen (O2) and carbon dioxide (CO2) levels change over time? 
B.What is always true about the total amount of O2 and CO2 in the test tube? 
2.Revise and repeat: Click Reset and run the experiment again, this time with the lights off. 
Graph your results below. Include units and label the axis.
A.How do the gas levels change?  
B.What is the total of O2 and CO2? 
3.Revise and repeat: Click Reset. Remove the plants. Repeat the experiment with two snails. 
Graph your results below. Include units and label the axis.
A.How do the gas levels change
B.What is the total of O2 and CO2? 
C.Why do the gas levels stop changing in this case
4.Summary: The total of the parts per million (ppm) when you add the concentration of O2 to the concentration of CO2 in the test tubes always stayed the same number. Explain why you think this is. (Hint: Molecules of carbon dioxide, CO2, are made of carbon, C, bonded together with two molecules of oxygen, O.)
Do this AFTER you have completed the Gizmo – you must complete this online and record your answers & explanations below to earn any credit for the whole Gizmo!

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