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Principles of diffusion in Biology
Effects of osmosis on.plant cells
Effects of osmosis on.plant cells
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Recommended: Principles of diffusion in Biology
Osmosis in Potatoes
Planning
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Introduction:
Osmosis is the special name used to describe the diffusion of water
across a membrane, from a dilute solution to a more concentrated
solution. In biology, this usually means the diffusion of water in and
out of cells. Osmosis is just one special kind of diffusion because it
is only water molecules we are considering.
Molecules will diffuse from where there is a lot of them to a region
where they are fewer in number; that is, front a region of highly
concentrated molecules to a region of lower concentration (below).
[IMAGE]
In a plant cell, when water molecules enter it, the vacuole will fill
and push against the cell wall. The cell will become very firm, or
turgid.
If a plant is in an environment where there is not much water, water
will leave the plant cells and move into the cells with less water.
The vacuole will shrink and the plant will wilt. When even more water
leaves the cell, the cell membrane tears away from the cell wall. This
is called plasmolysis.
To prove this, I will be performing an experiment in which I will
place potato cylinders into various sugar/water solutions for 24 and
observing the effect this has on the potatoes.
Method:
1) Use the boring rod to cut out 15 cylinder shaped pieces of potato
of equal volume, cut them into 5cm strips.
2) Dry the chips with a paper towel, and record their weight.
3) Put three pieces of potato each into 5 tubes.
4) Label each tube with 0.0m, 0.25m, 0.5m, 0.75m and 1.0m.
5) Pour the correct solution into the corresponding tube, just
covering the potato.
6) Leave the tubes for 24 hours. After 24 hours is up, dry the chips
with a paper towel, then weigh each potato chip and record the weight.
7) Also record the texture of the chips.
8) Work out the change in weight (M2-M1 / M1 x 100)
I will then leave all 5 test tubes for 25 minutes because that will be
Osmosis in Potato Chips Preliminary Experiment to investigate Osmosis 1M Sugar 50:50 0M (water) Initial mass 2.40 2.05 2.34 Final mass 2.01 1.85 2.43 Change in mass -0.39 -0.21 0.09 % change in mass -12.5% -10.5% 3.84% Evaluation From doing our preliminary experiment it enables us to gain a better result for our real experiment. From this experiment we have learnt a few things through trial and error, for example. If we had used a wider variety of concentrations, our results would have been more accurate. By using a syringe to measure the solution we would have also got a more accurate result. We could have also weighed the potato chips more accurately so they were roughly the same size with no skin.
Investigate the Osmosis of Potato Cells in Various Salt Solutions. Introduction I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment. The input variable is the concentration of the solution.
I am going to carry out an experiment to measure the change in mass of
the same way as it does potato. I would also widen the range of sugar
Osmosis in Carrots Background Osmosis is the diffusion of water from a dilute solution to a more concentrated solution through a partially permeable membrane, which allows the pass of water molecules but not solute molecules. [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]If a cell is placed in a less concentrated solution water enters because the less concentrated solution will have a high concentration of water than the inside of the cell. Once the cell takes in maximum water the cell becomes turgid. If the cell was to be placed in a high concentrated solution, water would leave the cell because the cell would contain a low concentrated solution. So in the low concentrated solution there will be a high concentration of water and in the high concentrated solution there will be a low concentration of water.
Osmosis Introduction Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. The aim of the investigation is to find the variables that affect the rate of osmosis and how they affect the rate of reaction. The variables that affect the rate of reaction of osmosis are, · The surface area of the object, · The concentration of the solution, · Temperature of the experiment Surface area If the surface area of the object is larger then more molecules can pass through the semi-permeable membrane. This will ultimately increase the rate of reaction. [IMAGE] [IMAGE] [IMAGE][IMAGE] Small surface area Large surface area Concentration
there would be no flow of water into or out of the cell so the cell
When I am not using them I will place them away from my experiment and
Investigating Osmosis In A Potato Introduction: "Osmosis is typically defines as the flow of one constituent of a solution through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way. Many membranes allow all or none of the constituents of a solution to pass through; only a few allow a selective flow. In a classic demonstration of osmosis, a vertical tube containing a solution of sugar, with its lower end closed off by a semi-permeable membrane, is placed in a container of water. As the water passes through the membrane into the tube, the level of sugar solution in the tube visibly rises.
We then put the stopwatch on and left them for half an hour. After we weighed each potato tube and recorded our results. We did the experiment twice. We did this to make sure our results were correct. Preliminary method: We did everything the same as in our other experiment except we
water in the potato, then the water will go out of the potato and into
4. Put milk samples into the beaker for about five and a half minutes and take samples out after time is up. 5. With the warm samples, open the pouch containing the gel cassette and remove the cassette.
An Experiment to Investigate Osmosis in Plant Tissue. Aim: To conduct an investigation to compare the osmotic behavior of the osmotic animal. two types of plant tissue in varying concentrations of sucrose. solution. Then we can find the solution.