AS COURSEWORK
To determine the isotonic point of plant tissue (potato).
Introduction.
This experiment is to determine the role of water potential of tissues in plants most particularly the movement of water into and out of potato storage tissue so that the isotonic point can be identified.
Prediction.
Potato is a plant that contains more starch grains and immature chloroplasts in the plant cells. Thus it has a lot of starch and little or no mono or disaccharides. I would predict that the when the potato chip is left in the solution it will increase in mass or decrease if the concentration of the solution is high or low. This is so because as the solute concentration increases this creates a hypertonic solution, thus more cell sap will be lost to create an osmotic balance. Also as the solute concentration decreases it creates a hypotonic solution and so less cell sap is lost but more solution is gained into the cell sap from the surrounding solution to create and maintain an osmotic balance.
At a certain concentration of solute, there will be no change in mass of the potato. This is because the concentration of the surrounding solution and the potato will be the same. Therefore there is no movement of solute molecules in either direction. This point is known as the isotonic point of the plant tissue.
To determine the isotonic point of plant tissue (potato).
Introduction.
This experiment is to determine the role of water potential of tissues in plants most particularly the movement of water into and out of potato storage tissue so that the isotonic point can be identified.
Prediction.
Potato is a plant that contains more starch grains and immature chloroplasts in the plant cells. Thus it has a lot of starch and little or no mono or disaccharides. I would predict that the when the potato chip is left in the solution it will increase in mass or decrease if the concentration of the solution is high or low. This is so because as the solute concentration increases this creates a hypertonic solution, thus more cell sap will be lost to create an osmotic balance. Also as the solute concentration decreases it creates a hypotonic solution and so less cell sap is lost but more solution is gained into the cell sap from the surrounding solution to create and maintain an osmotic balance.
At a certain concentration of solute, there will be no change in mass of the potato. This is because the concentration of the surrounding solution and the potato will be the same. Therefore there is no movement of solute molecules in either direction. This point is known as the isotonic point of the plant tissue.
