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- As photosynthesis proceeds, the oxygen gas produced will displace the liquid from the intracellular space, and the specific gravity will decrease, and the disks will float. The time required for the disks to float is inversely related to the rate of photosynthesis. The source of the carbon dioxide in this process is the bicarbonate solution.
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Why do leaf disks float up?
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This video is about photosynthesis and covers the AP Biology lab "What factors affect the rate of photosynthesis in living leaves". This lab is commonly cal...
- 9 min
- 23.3K
- Madden Science
Light leaves leaves light. Photosynthetic organisms capture energy from the sun and matter from the air to make the food we eat, while also producing the oxygen we breathe. In this Snack, oxygen produced during photosynthesis makes leaf bits float like bubbles in water.
- 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.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.
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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.
Jul 11, 2023 · To measure the rate of photosynthesis, you will replace the air in the spongy mesophyll in your leaf disks with a liquid. This will cause the leaf disks to sink. Then you will put these leaf disks in water with dissolved CO 2 and measure the amount of time it takes for the leaf disks to float.
