week 3 - -Move the lamp 100 cm away from the tubes with the...

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Bio 212 sec. 10 Time (min) normal seed cold treated seed 0 0.1 0.2 3 1.4 1 6 2.6 1.9 9 3.8 2.8 12 4.8 3.5 15 6.1 4.5 Investigating Photosynthesis Pre-Lab: -Obtain a piece of Elodea 5 to 6 inches long (healthy with active growing leaf bud). -Fresh cut the basal end and place in test tube with cut end up. -Fill test tube with 0.1 M NaHCO3 and rubber stopper containing a bent glass pipette. -Joint between rubber stopper and test tube must be dry to get a good seal. -Wrap the stopper with Parafilm to prevent “creeping”
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Bio 212 sec. 10 -Prepare a second tube without Elodea to act as a thermobarometer (the control). -Place both tubes in a beaker of water at room temperature. Set up heat filter and lamp.
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Unformatted text preview: -Move the lamp 100 cm away from the tubes with the heat filter in between.-Wait 10 minutes for equilibration and then measure light intensity with photometers.-After equilibration, measure the temperature in the Elodea water bath and record in table.-Adjust the fluids in the pipettes of both tubes so that they are at the 0.2 ml mark.-Read position of the fluid in the pipettes at two-minute intervals for 10 minutes.-at higher light intensities, greater movement will be seen.-Collect 3 more data sets with the light source at successively closer distances (75, 50, & 25cm).-Use a computer to graph the data collected in this lab....
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week 3 - -Move the lamp 100 cm away from the tubes with the...

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