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effect of osmosis on plant tissue variables
effect of osmosis on plant tissue variables
effect of osmosis on plant tissue variables
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Investigation of Osmosis in Plant Tissue
Aim
To investigate factors which affect the rate of osmosis.
The main factors which affect osmosis are:
Pressure
Temperature
Surface area
Solute Concentration
Plant Tissue
We will be investigating solute concentration as this is the easiest
factor to measure and will give us the most accurate results. We will
mainly investigate the different rate of osmosis when potato cells are
placed in solution with different solute concentrations. We are going
to use potatoes as they have homologues cells (all their cells are the
same).
Preliminary work
We investigated the rate of osmosis of potato cylinders left in
different solute concentrations.
Our hypothesis was that Rate of osmosis is proportional to the
difference in water potential inside and outside the cell.
Water potential(y) indicates which way water will move in a system.
Water will always move from a high y to a low y. y can be measured in
Kilopascals (kPa). Pure water has a y of 0 kPa. As solute is added, y
is reduced (it becomes a negative number.)
e.g.
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This is useful because you can add pressure to the equation.
If a pressure of 400 kPa is added to B (due to squeezing), the
equation is
-1000 + 400 = -600
-600 = -600
Now that the forces are equal, there will be no water movement.
We will measure y using Molar Concentration which has a concentration
of 0 - 1. Pure water has a y of 0M.
Using ’Biology, a functional approach’ by MBV ROBERTS, we deduced that
the y of a potato cell º 0.27M.
The water potential inside the cell is 0.27 M. I predict that there
will be the lowest rate of osmosis at this point and it will get
higher as the solute concentration levels move further away from
0.27M. The rate of osmosis will be higher when there is a greater
difference in water potential.
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.
I would also use what I have concluded at the end of the experiment to
Investigating Osmosis in Potatoes Preliminary Experiment Aim The aim of this experiment is to determine the solute concentration of potato tissue; i.e. To investigate at which point the sucrose concentration is the same as the solute concentration inside the potato (an equilibrium is reached) Introduction Osmosis is the movement of water molecules from an area of high concentration; (a weak solution), to an area of low concentration; (a strong solution), through a partially permeable membrane. My experiment will prove that the concentration inside the potato is lower than the concentration of the water molecules, outside the potato if using distilled water or very low concentrations of sucrose solution. Preliminary Method Cut two potato cylinders to the correct sizes e.g. 5cm in length, and dry them out using paper towels. It is important to dry out the potato cylinders because the excess water inside would have an effect on the results, and this would therefore create an unfair experiment. Then one must record their masses and lengths.
potato. To make it a fair test I will make sure that the tests will be
Investigating Osmosis in Potato Cells. Planning: What is the difference between Aim :- To investigate the effect of different concentrations of sucrose. solution, on potato cells. Osmosis :- Osmosis is the passage of high water concentration through a semi-permeable membrane to a region of low water concentration, i.e. the passage of water,.
through the visking tube with salt in. As in the visking tube it has a
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.
Below is a list of all the variables I can consider to use in my
the same way as it does potato. I would also widen the range of sugar
were not kept the same then it would not be a fair test, for example
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
0.2M, as there is too much weight loss at values below this for it to
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