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When you see tiny bubbles forming on the leaf disks during this experiment, you’re actually observing the net production of O 2 gas as a byproduct of photosynthesis. Accumulation of O 2 on the disks causes them to float.
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- Condiment Diver
- Conducting The Floating Leaf Disk Assay
- Analyzing Your Results
- Changing Variables to Investigate Photosynthesis
Before you start testing different variables, conduct the leaf disk assay once to get familiar with the procedure. The video Measure Photosynthesis with Floating Leavesdemonstrates how to do each individual step. You will do all your experiments in triplicates after your test run; the following instructions are for the three trials of your experime...
For each cup, create a graph from your data table that shows the number of floating leaf disks over time. Plot the time on the x-axis and the number of floating leaf disks on the y-axis. An example...
Now that you are familiar with the leaf disk assay procedure and data analysis, you are ready to start your own investigations.Choose one variable that you want to investigate. You can find some suggestions in Table 2. The table also provides some possible variations for each variable that you can test.Jul 11, 2023 · For photosynthesis to occur in the leaf disks that have had the air sucked out, you will need to provide the leaf disks with light and a good source of CO 2 dissolved in water. For this purpose, you will use a solution of sodium bicarbonate (NaHCO 3 ) in water.
Jul 26, 2022 · As oxygen is produced by photosynthesis, it comes out of solution and infiltrates the leaf tissue, replacing some of the water. This decreases the density of the disks, and they begin to float. The number of disks that float per unit of time gives a measure of the rate of photosynthesis.
Jun 30, 2019 · Watch spinach leaf disks rise and fall in a baking soda solution in response to photosynthesis. The leaf disks intake carbon dioxide from a baking soda solution and sink to the bottom of a cup of water.
- Anne Marie Helmenstine, Ph.D.
Do your leaf disks start to float sooner in a colder or a warmer baking soda solution? Test how the intensity of the light affects photosynthesis. Place the cup closer to your light source and farther away.
Biology. Floating Leaf Disk Photosynthesis Lab. By Kim. I use this experiment to reinforce what we’ve been learning in the photosynthesis lessons. I will be using principles of experimental design, scientific method, and CER as well. The floating leaf disk photosynthesis lab is pretty accessible.
