If a cell were placed in a hypertonic solution, it would lose water. All particles that pass through the plasma membrane by the process of diffusion do not require energy, so their movement is called passive transport. The transport of materials against a concentration gradient requires energy, so it is called active transport. .
METHODS.
As said before, the lab materials consist of 6 dialysis tubes, several beakers, distilled water, and different amounts of sucrose (utensils are a funnel, graduated cylinder, several pieces of string, and stating the obvious, towel paper). Dialysis tubing is a semi permeable membrane that is selectively porous and allows some molecules to pass through it. The beakers (250 mL) should all be labeled depending on the amount of sucrose that is in the bag and put in to that beaker. Soften the tubing by soaking each piece in a beaker of distilled water for a few minutes. The ends of the tubes can now be opened by rubbing them gently between your fingers. Seal one end of the tube by folding it over and tying it off very tightly with a piece of string. Using a separate funnel and graduated cylinder for each solution, pour about 20 ml of each of the following solutions into the open end of each separate bag: distilled water, 1% sucrose, 5% sucrose, 10% sucrose, 15% sucrose and 20% sucrose. Tie off the open end of each bag very tightly, but leave about an inch of empty tubing above the top of the solution. This extra space is called "head space" and is essential because water will enter the bags during the experiment. Noting that all solutions look the same once they are in the bag. Once the bag is tied securely, blot the bags with a piece dry towel paper then take the mass of each bag (record data). Then, put each bag in the right beaker depending on the amount of sucrose in the bag. Each bag should be covered with about 166 mL of distilled water and timed for 30 minutes in the beaker.
Osmosis Plan An introduction to osmosis. ... Osmosis in humans The kidney is made up of a very large number of tubules. ... Osmosis in animals. ... Therefore osmosis occurs. ... Then I worked out whether the sac had gained or lost weight by osmosis. ...
Osmosis Aim: - To investigate the factors that effect the osmosis in potatoes. Introduction: - Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. ... If you put a plant cell in water, water enters by Osmosis, then swells up. ... This will allow us to see whether osmosis has taken place, and to what extent. ... Preliminary Experiment: - In this preliminary experiment I will investigate the factors that affect the osmosis in potatoes. ...
I am going to investigate how the concentration of a sucrose solution affects osmosis in potato cells. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. Hypothesis: Osmosis is defined as the net movement of water or any other solution's molecules from a region in which they are highly concentrated to a region in which they are less concentrated. ... Some other Factors that effect osmosis are the: Temperature Surface area Time spent in the solution The shape and size of the potato used ...
Osmosis Osmosis is a kind of diffusion which only occurs with water. With osmosis, there is a membrane which does not allow dissolved material to pass though it but only water (selectively permeable) Osmosis is the movement of water molecules from a weak solution to a strong solution. Osmosis occurs when water is taken up e.g. ... ato cells by osmosis. ... This liquid or hydrostatic pressure works against osmosis. ...
The function of the contractile vacuoles is to pump water out of the cell caused by osmosis. ... This process is known as osmosis because the higher concentration that surrounds the Paramecium is moving itself to the lower concentration inside the Paramecium. 4. According to the laws of osmosis the plant cells should have exploded. ...
Investigating Osmosis Prediction Osmosis is defined as the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. ... The greater the concentration of water in the external solution the greater the amount of water that enters the cell by osmosis. ... At this point there will be no change in the length, volume and mass of the potato, as the net movement of water will be zero, no osmosis has occurred. ... At point A the graph suggests that no osmosis has occurred, suggesting that the concentration...
The overall result of osmosis is that water goes in the cell and the cell is expected to swell up. An example of osmosis in plants would be the absorption of water by the roots of plants. In animals, osmosis affects the supply of nutrients and the release of metabolic waste products. ... This lab was about diffusion and osmosis, in this lab we tried to organize the experiment the best we could. ... Conclusion This lab was about diffusion and osmosis, in this lab we conducted the experiment about how diffusion and osmosis work. ...
Key Words: semi-permeable, membrane, diffusion, osmosis, concentration gradient, homeostasis, isotonic, hypotonic, hypertonic Introduction The dependence of life processes on diffusion mechanisms could not be more prevalent. ... The spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient is known as osmosis. Osmosis allows cells to regulate the amount of water within their membrane in order to keep from shrinking or swelling (Glencoe/McGraw-Hill, 2006, p. 83...
Discussion and Conclusion Introduction: Background Information In the permeability lab, I gained an understanding of the principles of diffusion and osmosis. ... Osmosis is the diffusion of water through a selectively permeable membrane from a region in which it is highly concentrated to an area that has a lower concentration. ... Osmosis is important because it helps distribute nutrients and discharge metabolic waste products. ... Without osmosis, organelles would have a hard time carrying out duties; such like distribution of minerals and releasing waste. ... Discussion and Conclusion The p...
