Investigating Osmosis in Potatoe Tissue
To find out how the concentration of sucrose solution affects the rate
of osmosis in a potato and what happens to the length and mass of the
potato.
What is osmosis?
Osmosis is the movement of the water molecules across a partially
permeable from a region of high water concentration to a region of low
water concentration.
Osmosis is a special case of diffusion
The biochemical process in living cells always takes place in a
solution. A solution is made up of a solvent (the dissolving fluid)
and solute (the particles dissolved in the solvent). In living
organisms, the solvent is water and the solution is called aqueous
solution.
Living cells are separated from their surroundings by the partially
permeable cell surface membrane. The contents of the cell, the
cytoplasm, are one aqueous solution and the surroundings of the cell,
for example pond water, is another aqueous solution. If the two
solutions do not have the same concentration of various substances,
molecules may move away from one to the other by diffusion, if the
membrane is permeable these substances. To summarise osmosis:
The diffusion of water molecules, down a water potential gradiant
across a partially permeable membrane.
Cells and osmosis
A cell is surrounded by a partially permeable membrane, and water may
cross the membrane easily. If cell is placed in a solution of lower
water potential, water leaves the cell by osmosis. If the cell is
placed in a solution of higher water potential, water enters by
osmosis.
Plant cells and osmosis
When water enters a plant cell by osmosis the cytoplasm will swell,
but only until it pushes against the cellulose cell wall, as shown
below. The strong wall stops the cells from bursting. We say that the
cell is turgid. A plant cell will not be permanently damaged by the
entry of water. If water leaves a plant cell by osmosis the cytoplasm
will shrink, but the cellulose cell wall will continue to give some
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.
Investigating the Effects of Varying Sugar Concentration on the Amount of Osmotic Activity Between the Solution and Potato Tubes
Measuring The Rate Of Osmosis In Potato Cells Skill Area P. Osmosis is defined as free water molecules diffusing from a high concentration to a low concentration through a semi-permeable membrane. Variables - The rate of osmosis effected by many different living things, temperature of the solutions, surface area over which it can occur, Volume of solution, Volume of potato, distance through which the free water molecules have to pass and finally the difference in concentration of the solutions. This final factor is the one that we are going to test during the experiment. The temperature increase causes the cells to expand so the whole potato expands. Different volumes of potatoes at different temperatures could be measured, however trying to measure the temperature of a potato effectively without causing defects in other results would be quite hard with the equipment we are using.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
* Note the mass down in the table at the end of the first page.
When you place a potato chip in a salt or sugar solution, then if the
I am going to carry out an experiment to measure the change in mass of
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.
An explanation of the links between the topics: The dye was diffusing through the potato cells, this is the link between diffusion. Osmosis is linked to the experiment because in order for the diffusion to work the water would have to first need to go through the holes in the cells also known as osmosis. And finally Tonicity was a major part because the solution that the potato was in (pure water) was hypotonic which means that the cells had swollen which made it harder for the dye to move through the potato, and the hypertonic solution (50%salt water) did the complete opposite because instead of making the cells swell it made them shrink which made it easier for the dye to pass through the potato.
the same way as it does potato. I would also widen the range of sugar
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.
water in the potato, then the water will go out of the potato and into
is put in pure water it will become turgid and it will not burst due
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.
When I am not using them I will place them away from my experiment and