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Results of osmosis in potatoes
Results of osmosis in potatoes
Results of osmosis in potatoes
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Factors that Affect Osmosis in Potato Cylinders
The aim of this experiment is to investigate the volume of sucrose
solution and the weight and volume of other variables which affect
osmosis in potato cylinders. In this experiment I will weigh and blot
rings of potato and test them in different concentrations of sucrose
solution. I hope to find sufficient results as to investigate this.
In this experiment I will be investigating, and putting to test, the
theory of osmosis.
The scientific theory of osmosis is the diffusion of water through a
selectively permeable membrane into a more concentrated solution of
sucrose. Because the more concentrated solution contains a lower
concentration of water molecules, the water flows by diffusion to
dilute it until concentrations of solvent are equal on both sides of
the membrane. In simple terms, it may also be thought of as the
passage of water molecules from a low solution to a high one, across a
selectively permeable membrane. (This is shown in the diagram below).
Sugar solution Distilled water
Sugar
molecule
water molecule
Low
High
Water
Water
Potential
Potential
Selectively permeable membrane
Another experiment, published by the author B.S Becket in “Biology-a
modern introduction”, gives a clear...
... middle of paper ...
...ffect the osmosis in the
potato ring. This confirms my prediction earlier that it is the
concentration of the sucrose solution not the size or weight of the
potato ring that affects osmosis.
Overall my results seemed accurate enough. They backed up and
developed my understanding of osmosis, and seemed to fit in with my
theory and scientific knowledge. I could of perhaps taken more time
over the cutting of the potato cylinders into rings, and measured my
sucrose solution as accurately as I could manage. Although I do not
think this would have affected my experiment directly, I t would have
made my results clearer and easier to interpret. Of course I could
have repeated my experiment for more accurate results, but this was
just not possible . I believe I have successfully investigated all the
factors I intended to.
Conclusion In my conclusion, the potatoes with the lowest concentration gained the most mass, and would become hard relating back to the Turgor theory I stated earlier. In contrast to this, the potatoes in the most concentrated solution lost the most weight thus becoming plasmolysed and limp also relating back to the background I have mentioned earlier. Evaluation In general the experiment was succesful the results were consistent and also were in accordance with the theories made at the start.. The experiment could have been improved by: · More subjects used instead of potatoes · More potatoes · Wider time ranger · Different molarities Using this variety of methods could have improved the experiemnt, however I was generally satisfied with the results of this osmosis experiement.
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.
When I am not using them I will place them away from my experiment and
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.
The Effect of Water Concentration on the Mass of Potato Tissue Aim: The aim of this investigation is to discover the effect of water concentration on the mass of potato tissue, and also to investigate the movement of osmosis through potato tissue. Scientific Knowledge: When a substance such as a sugar dissolves in water, the sugar molecules attract some of the water molecules and stop them moving freely. This, in effect, reduces the concentration of water molecules.
To investigate the osmotic effect of changing the concentration of sucrose solution; distilled water, 20% sucrose solution, 40% sucrose solution, 60% sucrose solution on the change in mass of potato cylinder after 30 minutes of being in solution.
Water Potential of Potato Cells Aim: To demonstrate the Water Potential of Potato Cells. Objectives: · To show the water potential of potato cells using various measured concentrations of a sucrose solution and pieces of potato. · To record and analyse data to verify observed results. · The method and procedure was carried out as per instruction sheet. Observations: The experiment shows that the lower the concentration of the sugar solution, in the Petri dish, the mass of the potato increased.
the same way as it does potato. I would also widen the range of sugar
and then lids were put on. They were then left for 24 hours in a
Osmosis is a biological process. If equilibrium is ever achieved, then water molecules will move. back and forth between the substances. If a surrounding sucrose solution has a lower water potential than the plant tissue in the solution, then, through osmosis water will move from the tissue into the. the surrounding solution, the tissue will lose mass and length as a result.
The Investigation of Osmosis in Potato Chips Osmosis will occur across a semi-permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane, and when this happens to cells they will either become turgid if water flows into them, or plasmolysed if water flows out of them, and therefore changing their mass. Aim: To investigate how changing concentration in a sugar solution affects the rate of osmosis in potato chips. Prediction: I predict that as potato chip is placed in a solution of high water concentration then the potato chips will increase in weight and if put in a low concentration then it will do the opposite. If the concentration of a solution into which a potato chip of 2cm of a potato is placed is greater than a certain level the potato chip will contract, and if the concentration is less than that level it will expand. This can be seen in living cells.
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
there would be no flow of water into or out of the cell so the cell
Determining the Concentration of the Cell Sap in Potato Storage Tissue Aim: To determine the concentration of the cell sap in potato storage tissue. By using Osmosis, determine what the sugar concentration of cell sap is. Prediction I predict that the potato segment in the distilled water will definitely gain in weight because the solution outside it has a much higher concentration of water then in the cell sap meaning Osmosis will occur and the potato segment take in water. I predict that 0.2M sugar solution will also gain weight because it still has quite a high concentration of water outside the potato. The potato in the 0.4M solution will gain weight but the potato in the 0.6M and 0.8M solutions will lose weight.