Analysis Of Lab 1c-Using The Potato Core Borer

ntroduction: Cells have kinetic energy. This causes the molecules of the cell to move around and bump into each other. Diffusion is one result of this molecular movement. Diffusion is the random movement of molecules from an area of higher concentration to areas of lower concentration. Osmosis is a special kind of diffusion where water moves through a selectively permeable membrane (a membrane that only allows certain molecules to diffuse though). Diffusion or osmosis occurs until dynamic equilibrium has been reached. This is the point where the concentrations in both areas are equal and no net movement will occur from one area to another.
If two solutions have the same solute concentration, the solutions are said to be isotonic. If
Mass each bag. Put each bag into a beaker of distilled water and let stand for half and hour. After 30 minutes is up, remove each bag and determine its mass. Record all data in its appropriate table.
Lab 1C - using the potato core borer, obtain 24 cylindrical slices of potato, four for each cup. Determine the mass of the four cylinders. Immerse four cylinders into each of the six beakers or cups. Let stand overnight. After time is up, remove the cores from the sucrose solutions and mass them. Record all data in its appropriate table.
Lab 1D - Using the paper, pencil, and calculator collected, determine solute potentials of the solutions and answer the questions asked to better understand this particular part of the lab.
Lab 1E - Using the materials gathers, prepare a wet mount slide of the epidermis of an onion. Draw what you see of the onion cell under the microscope. Add several drops of the NaCl solution to the slide. Now draw the appearance of the cell.
10) The distilled water would have a higher concentration of water molecules and would also have a higher water potential. The red blood cells would increase in size because water is moving from the area of higher water potential (the distilled water) to the area of lower water potential (the red blood cells) until dynamic equilibrium is reached.
Lab 1E Questions
1) After preparing a wet mount slide, I have observed the onion cells under magnification and they appear to be small, empty boxes pushed closely together.
2) By adding two or three drops of NaCl the cells should have shrunk, but no change took place.
3) The cells maintained the same shape.
4) Plasmolysis is the lose of water and turgor pressure in a cell.
5) The onion cells should have plasmolyzed because the area surrounding them had a lower water potential and water should have moved out of the cells.
6) Grasses that live on the sides of roads that have been salted in the winter end to dies because the water is drained from the cells as it moves out of the grass cells into the hypertonic NaCl area around it.
Lab 1D Plasmolysis of Cells - Drawings of onion