Tuber

DETERMINATION OF THE WATER POTENTIAL OF POTATO TUBER CELLS. Method. Five sucrose solutions with varying molarity and one control containing distilled water were prepared and poured into test tubes. The potato discs were dried, weighed and added to the test tubes. The discs were then weighed again after a period of 24 hours. The percentage change in mass was then calculated. Apparatus.  Specimen tubes with stoppers x6  1cm3 diameter cork borer  razor blade

Osmosis in Potato Tubers Andrew Dickson Background When a plant cell is bathed in a solution of the same concentration (isotonic) as its intracellular environment, its mass and volume remain the same. This is because water enters and leaves the cells at the same rate. There is no net loss or gain of water by osmosis. Samples of cells can be placed in a range of solutions of different concentration. The cells will gain water by osmosis when placed in solutions which are more dilute (hypotonic)

Sucrose Solutions to Determine Osmolarity of Potato Tubers Based on Weight By Thomas Pelikan Biology 200A Section 004 Kimberly Schmidt October 2, 2012 Abstract: In this experiment we were trying to determine the osmolarity of potato tubers by weighing them before and after incubating them in solutions of sucrose with varying molarities. To find the osmolarity we took a potato and used a cork borer to obtain seven samples of potato tubers. We then prepared seven beakers with concentrations

Roots and tuber crops such as potato, beet, carrot, radish, parsnip and turnip have long been staple dietary components of the people of Newfoundland and Labrador. As such, diseases that affect the production of these crops have a direct impact on both the farmers and the consumers. The common scab disease is an important disease of root and tuber crops in Newfoundland. The disease is characterised by superficial or corky-like lesions that form on the surface of the crops (Figure 1). The lesions

OSMOSIS Aim To determine the water potential of potato tuber cells. Background knowledge Osmosis is defined as the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane. Osmosis is considered in terms of water potential and solute potential. Water potential is a measure of the kinetic energy of water molecules. Here, water molecules are constantly moving in a random fashion. Some of them collides with cell

An investigation to find the water potential of potato and carrot tubers in a sucrose solution, of concentration 0.00 – 0.50Mol, over a 24 hour period Interpretation Written Communication C1 From our graph it can be seen that the concentration of sucrose solution is 0.18 M at 0% change in mass for the potato and 0.355 M at 0% change in mass for the carrot. I will use these values to find the solute potential by using the calibration graph. I will work out the water potential by using the

Results The relative osmotic concentration was determined by measuring the percent change in mass of the potato tissues. Change in mass was measured of six solutions, each containing different levels of concentration (0, 0.1, 0.2, 0.3, 0.4, and 0.5). The percent change in mass decreased as sucrose concentration increased, therefore, relative osmotic concentration also decreased as sucrose concentration increased. However, the osmotic concentration of 0.2 M sucrose solution was relatively greater

inulin from a tuber requires following two major steps. 1) EXTRACTION: This includes Pretreatment, Homogenization and Solvent extraction 2) PURIFICATION: This further proceeds through Deproteination, Decoloration, Precipitation and Drying The initial pretreatment involves cleaning as well as de-activation of an enzyme called Polyphenol Oxidase . This is an enzyme present in the epidermal cells of the tuber and as a result a series of metabolic processes continue to take place in the tuber even after

the ideas or writing of other individuals/authors. _Alexandra DeWitt_____________ __5/1/13____________ Author Date _10_________ Lab Section # Increasing Sucrose Concentrations Causes the Osmotic Concentrations of Disks of Potato Tubers to Decrease Abstract: Introduction: The biological membranes are composed of phospholipid bilayers, each phospholipid with hydrophilic heads and hydrophobic tails, and proteins. This arrangement of the proteins and lipids produces a selectively

the amount of osmotic activity, between the solution and a potato tuber of a given size. The purpose of this experiment is to demonstrate how living cells rely on osmosis, the diffusion of water.   Osmosis is the movement of water molecules (H20) from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane