This website uses cookies to ensure you have the best experience. Learn more

Water Potential Of A Potato. Essay

1516 words - 6 pages

Investigating the Water Potential of a Potato.I have been asked to investigate the water potential of a potato. During my investigation I will not actually be able to measure a value for, as it is a pressure value (kPa).Osmosis is a special form of diffusion involving only water molecules. It is defined as "The passage of water from a region of high water potential to a region of low water potential through a partially permeable membrane"Definition of Water Potential.The potential for water to move across a selectively permeable membrane, where the osmotic potential of distilled water is 0 (kPa) and any water movement is measured with a negative value.When a solute is mixed with a solvent the water potential will decrease, and will always be a negative value.Solute Potential.As the presence of a solute lowers the water potential, the more concentrated the solute is, the lower the water potential will be.Pressure Potential.This is if pressure where applied to a solution it would resist the movement of water. There is an equation that can represent to relationship of water potential, solute potential and pressure potential:= s + pOsmosis and Plant CellsLike animal cells, plant cells contain a number of solutes. When these cells are put into pure water, water moves into the cell because there is a lower water potential in the cell. But unlike animal cells, plant cells cannot control the amount of fluid surrounding the cell.If a plant cell is placed in a solution with a lower water potential than the plant cell, water will move leave the cell, and the cell becomes plasmolysed (flaccid).If the plant cell is place in a solution with the same water potential, there will be no net movement of water. The cell is then said to be incipient plasmolysis.The table below shows what happens to the cell when water moves in and out of a cell.Water potential of solution compared to cell Higher Equal LowerNet movement of water Enters cell Neither enters or leave Leaves cellProtoplast Swells No change ShrinksCondition of cell Turgid Incipient plasmolysis Plasmolysed (flaccid)A plant cell, unlike an animal will not burst when water moves into a cell, it becomes turgid. This is because the cellulose cell wall prevents it from bursting.PlanTo find the water potential of a potato I will be placing fixed volumes of potato, with the same surface area, into different concentrations of sucrose solutions.Preliminary ExperimentWhat I DidI began by cutting cylinders of potato using a borer which had a diameter of 1cm. I then cut the cylinder of potato to a fixed length of 2cm. I then weighed the mass of the cut potato cylinder using a sensitive balance. I did this twice, so I had 2 cylinders of potato the same volume.One of these potato cylinders was put into a beaker containing 0.2M sucrose solution and the other in a beaker containing 0.7M sucrose solution. Everyone put their potato cylinders in the same beakers.They were left in the solution for approx. 48 hours, we then...

Find Another Essay On Water Potential of a Potato.

a drink of water Essay

958 words - 4 pages Seamus Heaney “A Drink of Water” Seamus Heaney’s poem “A drink of water” is about an old woman that was close to her death also she stays in the country which is a very small population. Her home was almost in the middle of nowhere. She stayed alone with her dog. The dog was gray and possibly old, she and her dog go to the lake every day to get water; Not only for her but her dog too. And they repeat that process like every other day

Potential Effects of a Depleted Ozone Layer

2424 words - 10 pages The Potential Effects of a Depleted Ozone Layer' And God said, let there be light and there was light and then God saw the light, thatit was good ' ( Genesis 1: 3-4 ). Undoubtedly, light is good. Without light man could notsurvive. Light is the ultimate cosmic force in this universe allowing man to progress andflourish. In the form of heat, light from the sun warms the Earth. Light, also, is the singlemost important factor influencing the growth

A Study of Reciprocity-Arousing Potential

2006 words - 8 pages them engaging in providing help. In a study on the reciprocity associated with certain jobs and the amount of help provided by strangers, there proved to be a positive correlation in the amount of help provided when the job had a high reciprocity-arousing potential. Compared the accountants, insurance salesmen, and gas station attendants, people who are physicians, youth counselors, and firemen provide more help as part of their career (Yinon

Exit Exams: A Gauge of Potential

1772 words - 8 pages work" for U.S. companies” (Riordan 1). Also, according to Riordan, the absence of an exit exam is the same as telling employers to “Hire me. Take a risk. I may or may not be able to do 8th-grade math” (1). In conclusion, high school exit exams are a necessary instrument to gauge a student’s potential ability to succeed after high school. First of all, colleges use standardized tests to measure a student’s ability to think, and retain information

Determining the Water Quality of a Body of Water

829 words - 3 pages Water quality is a complex term to evaluate. The health of a water ecosystem depends on so many variables. These parameters are each intertwined and connected. For simplicity there are several mainstream parameters that are used in conjunction with each other to determine the water s quality. These include: alkalinity, ammonia content, carbon dioxide, chlorine, nitrates, dissolved oxygen, phosphates, temperature, and turbidity. The most

The Concentration of Sugar in the Cell Sap of a Potato Cell's Vacuole

1898 words - 8 pages The Concentration of Sugar in the Cell Sap of a Potato Cell's Vacuole Plan In this experiment I am intending to investigate the concentration of sugar in the cell sap of a potato-cell's vacuole. I will discover this using my knowledge of the biological process of Osmosis. Osmosis is the movement of solvent (usually water) through a semi

Investigate the Effect of Varying Solution Concentration on Osmosis in a Potato Chip

4330 words - 17 pages Investigate the Effect of Varying Solution Concentration on Osmosis in a Potato Chip Prediction A definition of osmosis is: 'the movement of water molecules from an area of high water concentration to a low water concentration across a semi-permeable membrane' (Oxforddictionary 2000). In a high concentration of water the amount of solute (e.g. sugar) is low. These solutions are usually known as a dilute or weak solution. But in a low

Evaluation of fluensulfone, a novel nematicide for control of the potato cyst nematode, Globodera pallida

942 words - 4 pages , comprising purely of G. pallida (Minnis et al., 2002). This increase in G. pallida is suggested to be a pitfall of increased cropping frequency of potato carrying the H1 gene, expressing complete resistance to G. rostochiensis, but is susceptible to G. pallida (Trudgill et al., 1996). Soil treatment with synthetic nematicides is commonly practiced in the UK (Whitehead, 1998; Whitehead, 1986) and the method has remained a key component of the

Biology Coursework: The effects of Osmosis on a potato chip in Sugar Solution

803 words - 3 pages Biology Coursework: Effect of Sugar Solution on Potato ChipsPlanningBefore planning the experiment, I will research osmosis, so that I can make predictions. This will help me to discover how to make this investigation fair and safe. Planning ahead will help me find out the order in which to carry out the experiment. This should lead me to good results at the end of the experiment.HypothesisOsmosis is the passage of water from a region of high

Biofuels: There is Potential Needs A Lot of Work

884 words - 4 pages investors and their trust in producing biofuels as an alternative which further delays the potential of using biofuels. Besides the biggest money factor in the debut of biofuels on a global scale, there are many other factors that proves it is not the best option as an alternative fuel source. With the mass variety of biofuels, there are many ways in which they can produce biofuels however, many issues lie within the process of production. In the case

IDENTIFICATION AND EVALUATION OF A POTENTIAL BUSINESS VENTURE

1208 words - 5 pages appendix 3 case study). A business that provided access to all business services under one network would be able to establish relationships with a variety of SME’s with high potential of ‘cross selling’ the services and give credibility to the consultants working with them via association. In the Thames Valley area there is not currently an established presence of a ‘one-stop shop’ which provides all of these business to business consultancy

Similar Essays

Investigate The Water Potential Of Potato Cells

3564 words - 14 pages Investigate the Water Potential of Potato Cells Introduction In my investigation, I hope to determine the water potential of potato cells. The plant material I will use in my investigation will be potato chips, which I will cut myself prior to the investigation. I hope to find the concentration of a solution where the chip stays the same mass and length, which will tell me that the water potential inside the cells is the same as the

Determining The Water Potential Of Potato Tubers Using Gravimetric Anc Chardakov Techniques

1715 words - 7 pages Determining the Water Potential of Potato Tubers using Gravimetric and Chardakov Techniques 1. INTRODUCTION: Water potential (W) is the measure of free-energy status of water in plant cell, which is the driving force governing the movement of water into and out of the plat cell and affect various metabolic activities (O’Leary, 1970). Water potential is depends on different solute concentrations, pressure and matrix a particle; measured in

Investigation The Water Potential Of A Root Vegetable

1901 words - 8 pages When the water potential of the surrounding solution is less negative than that of the potato cells, water enters the cells’ vacuoles by osmosis causing the turgor of the cells to increase. Method 1. Using a cork borer remove a core of potato. 2. Use a white tile to push the cork borer into the potato. 3. Using a scalpel or razor blade cut the skin off the ends of the potato cores. 4. Cut the potato

Finding The Concentration Of A Potato Cell

3783 words - 15 pages AimThe aim is to find the concentration (mole/dm3 (M)) of solute in a potato cell by using the process of osmosis and different concentrations of sucrose solution.Background informationOsmosis is diffusion of water across a partially permeable membrane. It moves from a solution with less solute concentration (high water potential) to a solution with more solute concentration (low water potential). The one with a high water concentration is