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factors that affect Osmosis
Effect of osmosis to plant
Effect of osmosis to plant
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The Factors Affecting Osmosis in Potato Tissue
Planning
In this coursework I am investigating the factors affecting osmosis in
potato tissue.
[IMAGE]
Osmosis is defined as the net movement of water molecules from a
region in which they are highly concentrated to a region in which they
are less concentrated. This movement must take place across a
partially permeable membrane such as a cell membrane, which lets
smaller molecules such as water through but does not allow bigger
molecules to pass through. The molecules will continue to diffuse
until the area in which the molecules are found reaches a state of
equilibrium, meaning that the molecules are randomly distributed all
over an object with no area having a higher or lower concentration
than the other.
Plant cells always have a strong cell wall surrounding them. When they
take up water by osmosis they start to swell, but the cell wall
prevents them from bursting. Plant cells become turgid when they are
put in dilute solutions. The pressure inside of the cell rises and
eventually the internal pressure of the cell is so high that no more
water can enter the cell. The liquid pressure works against osmosis.
Turgidity is very important to plants because this is what makes the
plants stand up to the sunlight. When plant cells become flaccid this
is when they loose water by osmosis this is the exact opposite of
turgid. The content of the potato cell shrink and pulls away from the
cell wall.
To create a fair test certain parts of the experiment will have to be
kept the same whilst one other key variable is changed. I have chosen
to change the concentration of the external solution each time. This
will give me a varied set of results. If any of the other variables
were not kept the same then it would not be a fair test, for example
if one of the potato chips was a different length to the rest this
would affect the results and therefore would conclude in an unfair
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.
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.
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.
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.
An Investigation of Factors Affecting the Rate of Osmosis Introduction Osmosis is the movement of water molecules across a semi permeable membrane from a region of high water concentration to a region of low water concentration. [IMAGE] A semi permeable membrane is a membrane with very small holes in it; they are so small that only water molecules can pass through them. Bigger molecules such as glucose cannot pass through it. In actual fact water molecules pass both ways through the membrane, but because there are more water molecules in the high concentration region than the other there is a steady net flow into the lower concentration region. The lower concentration is the stronger solution, such as a glucose solution.
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.
I am going to carry out an experiment to measure the change in mass of
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
there would be no flow of water into or out of the cell so the cell
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
When I am not using them I will place them away from my experiment and
4. Put each group of potato discs in one of the 6 test tubes and watch