Since my last post, we had a 6 day weekend. We had two snowdays, Wednesday and Thursday, and had Friday through Monday off. Today, Tuesday, February 16th, 2010. I restarted taking my data, because I decided that my plants went too long without UV light. My Elodea, each 6 1/2 inches in length, are beginning to brown on the corners of the leaves. I also decided that instead of measuring the oxygen production of two test tubes of Elodea, I'll only be measuring one as measuring both is too time consuming. But, I will still be subjecting the other test tubes to UV light just in case the Elodea that I'm using dies. Today, I measured my control, and my two and seven hour Elodea.
Here's my data:
2 Hour: 18% oxygen
7 Hour: 10% oxygen
Control: 20% oxygen
I've noticed that the water in my test tube evaporates, so I have begun placing parafilm, a waxy type of stretchy plastic, over the top of the test tube. When I am not testing the oxygen production of my Elodea, they are kept under their separate boxes, except for the control which is always out on the table.
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