Photosynthesis Lab . http://www.cleanvideosearch.com/media/action/yt/watch?videoId=ZnY9_wMZZWI&name=Photosynthesis+Lab+Walkthrough&uploadUsername=bozemanbiology&hitCount=9244.
33 points totalTitle: The Floating Leaf Disk Assay For Investigating Photosynthesis 1 pt Purpose: Will there be a difference in the rate of disks floating in water with carbon dioxide and water without over a 10 minute period of time? 2 ptsHypothesis: Null hypothesis: IF10 disks are placed in water with carbon dioxide and 10 in water without, then there will be no difference in the two group’s rate of disks floating after 10 minutes. 1 pt
In the first part of the lab, students learn how to measure the rate of photosynthesis indirectly by using the floating leaf disk procedure to measure oxygen production.
In the floating leaf disk procedure, a vacuum is used to remove trapped air and infiltrate the interior of plant (leaf) disk samples with a solution containing bicarbonate ions that serve as a carbon source for photosynthesis. The infiltrated leaves sink in the bicarbonate solution. When placed in sufficient light, the photosynthetic processes then produce oxygen bubbles that change the buoyancy of the disk, eventually causing them to rise.
4. Pour the disks and solution into a clear plastic cup. Labeled water Use the clear syringe for the water!