Bio II Elodea Lab: Photosynthesis and Cellular Respiration

Place one test tube under bright light or a reflector lamp, the second test tube in day light, the third in diffuse light, and the fourth in total darkness. After about 15 minutes, observe the cut ends of each plant. Count the number of oxygen bubbles given off by each plant in one minute. Then count the number of bubbles in five minutes. ................
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