This means that when the plant cells are placed in a strong sugar solution (where there is more sugar than water.) there will be a decrease in weight and volume. This process is defined as plasmolysis. This is where the cell membrane pulls away from the cell wall, this is because a lot of water has been moved from the cell as the plant cell has the strong concentration of water and the solution has a weak concentration the water will move from the plant top the water. Sometimes the cell will shrivel up completely and it becomes flaccid.
This is due to osmosis. Osmosis is the diffusion of water from a... ... middle of paper ... ...also have an assistant to help me remove and place the potatoes in the solutions so that they all had equal amounts of time in their solutions. I can not make my experiment perfect as the are some limitations to my equipment. To obtain more evidence with osmosis I could improve certain addition aspects like the amount of solution in the test tubes, so that you could get results on whether the amount of solution affects the amount of osmosing a potato chip can do. Some potatoes could have more sugar in than others, so to extend my investigation I could produce results on which potatoes have more protein in.
The cell membrane is similar to the membrane mentioned above, so the cell would lose water because of osmosis if it were placed in an environment in which water concentration is greater than that of the cell. A solution is isotonic if the concentration of dissolved substances is the same as the concentration inside the cell. Osmosis does not occur in an isotonic solution. A hypotonic solution is a solution in which the concentration of dissolved substances is lower than the concentration inside the cell. If a cell were put in a hypotonic solution, osmosis will cause water to move through the cell membrane into the cell.
An investigation of the glucose concentration of the cell sap in potato cells In this experiment I intend to investigate the effects of osmosis on potato cells. Specifically, I intend to use my knowledge of osmosis to investigate the glucose concentration of the cell sap in potato cells. Osmosis is a method by which water levels on either side of a semi permeable membrane may balance themselves. It occurs between regions of high water concentration and low water concentration. As it is a special method of diffusion exclusive to water, it also allows dilute and concentrated solutions to balance their strengths.
Osmosis Investigation We are trying to find out what the concentration of the solutions is inside the vacuole of a potato cell. We will investigate how the mass of the potato chips change in different sucrose solution concentrations. We will use osmosis to do this. I will be measuring and controlling many different variables, these include; - The dependent Variable – Weight of potato chip Independent Variable – Concentration of sucrose Control Variables consist of; - 1. Temperature 2.
Eventually the cell stops taking up water, even though the concentrations inside and outside are not even. This is because the cell wall becomes stretched and prevents any more water entering. The cell is said to be turgid. Cells placed in a concentrated sugar solution lose water by osmosis, as the water potential is higher inside the cell. As there are more water molecules inside the cell, more water molecules leave the cell than enter it.
If a plant cell is placed in pure water, water outside the cell will flow into the cell by osmosis as the interior of the cell has a lower water potential than the pure water. The reason why the interior has a lower water potential is because the cytoplasm has substance like glucose dissolved into it. As more and more water flows into the cell the cell becomes more and more rigid. Eventually the cell becomes turgid and this is when the cell will not accept anymore water as the water potential inside and outside now balanced. If we replicated this with an animal cell it would burst as water would enter osmotically and then the cell would become rigid and there would be no support from a cell wall, and thus the cell will burst.
Sometimes plants cells can be placed in more concentrated sugar solutions, although this is unlikely in nature. If this happens the water passes out through the central vacuole, through the cytoplasm, the cell membrane and the cell wall into the solution outside the cell. This causes the pressure inside the central vacuole to decrease. The cell looks visibly deflated and limp. This state is known as plasmolysed.
Investigation Into Osmosis Aim === The aim of this experiment is to compare the change of mass of potatoes when they are in a Starch and water solution. The reason the mass would changes is due to osmosis. Introduction ============ [IMAGE] Osmosis is the process of water passing from a region of high concentration of water, through a semi-permeable membrane to a region of low water concentration. Osmosis occurs when there is more water on one side of the cell than the other. In the example to the right the small blue particles represent water.
The diagram above is an example where osmosis has taken place. The weak sugar solution is separated from the strong sugar solution by a semi-permeable membrane, with the water diffusing from the weak solution until both solutions are of equal strength. However, as only water can move through the semi-permeable membrane, equal concentrations of solutions can not always be reached. Examples of everyday diffusion include : * Oxygen diffusing from airsacs in the lungs into blood capillaries around the airsacs, while carbon dioxide diffuses from the blood into the airsacs. * In the gut wall, digested food, e.g.