682 Words Nov 5th, 2012 3 Pages
No.06 Determining water potential of potato tuber cells: the weighing method

If a plant cell is in equilibrium with an external solution of such a concentration that there is not net loss or gain of water, the water potential of the external solution will be equal to the water potential of the cell.

Use of this fact can be made in estimating the water potential of a plant tissue. Samples of tissue are immersed in a range of external solutions of different strengths. The solution that induces neither an increase nor a decrease in the volume or mass of the tissue has the same water potential as that of the cells in the tissue.

The cells to be investigated in this experiment are those of the potato tuber. Changes in mass will be
The latter, being the independent variable, should be on the horizontal axis; the former on the vertical axis. 7. Calculate the water potential of the potato cells as follows. Find the point on your graph corresponding to a percentage mass change of zero. The molarity of sucrose corresponding to this zero mass change can now be read from the horizontal axis. From table 4.1 find the water potential of a sucrose solution of that molarity. That is the water potential of your sample of potato cells. Express your result in a kPa.

For consideration

1. Criticise this method of finding the water potential of plant cells. How might it be improved? 2. What was the reason for dividing each cylinder into six discs, and why was it necessary to standardise the procedure for drying the discs? 3. With what kind of plant tissue might it be possible to use a change in volume rather than mass for estimating the water potential? 4. How does the value of the water potential differ from the osmotic potential of the solution in the vacuole? 5. In constructing your graph did you join up the points with straight lines or just a smooth curve? Justify whichever technique you used.

|Molarity (mol dm) |Osmotic potential kPa |

## Related Documents

• ###### Essay on Financial

Assigment Financial Statement Analysis Dec 2013 Prepare for: Mr. PH Tan Prepare by: Mohamed Yusri Bin Sehat ST1110537 Contents Introduction 2 Objective of paper 2 Executive summary 2 Firm, Industry, and Environment 2 Description of firm and its management 2 Discussion of competitive environment 2 Economic climate and outlook 2 Other factors, e.g. government regulations, labor relations 2 Building blocks of financial statement analysis 2 Vertical and horizontal…

Words: 1665 - Pages: 7
• ###### Organizational Challenge: Independent Contractors Essay

employees through the levels in OB: ICs=individual, Special Forces=Group and Xe=Organization. First, we will review the description of ICs while providing an explanation why businesses prefer to use ICs versus employees. Then we will provide a brief summary on the history of a private company called Xe, formally called Blackwater USA, who hired ICs to perform armed security for the Department of State in Iraq. Next, we will examine cultural problems that exist within a company like Xe. Before concluding…

Words: 2269 - Pages: 10
• ###### Coffee House Proposal Essay

1.0 EXECUTIVE SUMMARY 1.1 INTRODUCTION This business plan is intended to serve as a starting point for a potential coffee shop at Kelana Jaya, Petaling Jaya. While the plan provides an extensive look into the feasibility studies of such an endeavour, we recognize that further research may be required before undertaking this business. We have provided all the ﬁnancials including the balance sheet, income statement and cash ﬂow statements. However, our research shows that the starting and sustaining…

Words: 3326 - Pages: 14
• ###### Case Study Product Innovation at Bank of America Essay

focuses on core competencies (that is, business-as-usual innovation), seven percent on game-changing innovation MAY–JUNE 2009 within core competencies and only three percent on leaps that signiﬁcantly shift the client experience. Outside of banking, an evolutionary approach to innovation is also the rule, not the exception. Continual improvements throughout a product’s life cycle build brand equity. Take the case of Nabisco’s Oreo cookie, the bestselling cookie in the United States. In 1912, Nabisco…

Words: 2989 - Pages: 12
• ###### Product Innovation at Bank of America Essay

focuses on core competencies (that is, business-as-usual innovation), seven percent on game-changing innovation MAY–JUNE 2009 within core competencies and only three percent on leaps that signiﬁcantly shift the client experience. Outside of banking, an evolutionary approach to innovation is also the rule, not the exception. Continual improvements throughout a product’s life cycle build brand equity. Take the case of Nabisco’s Oreo cookie, the bestselling cookie in the United States. In 1912, Nabisco…

Words: 2997 - Pages: 12
• ###### engl 216 week 7 Essay

Sincerely Anthony Smith, Human Resources CONTENTS PAGE LIST OF ILLUSTRATIONS 1 EXECUTIVE SUMMARY 3 INTRODUCTION 4 COMPANY STRAGATIES 4 A GOOD FIT? 5 ACCTUAL COST 6 STEPS IN THE RIGHT DIRECTION 8 CONCLUSTION AND RECOMMENDATIONS 9 ILLUSTRATIONS PAGE RISK 7 HIDDEN COST 8 EXECUTIVE SUMMARY The topic of turnover rates is like the pink elephant in the room. Everyone knows it is there…

Words: 2736 - Pages: 11
• ###### Essay Galaxy 's Market Plan For Galaxy

Executive Summary Galaxy is a U.K. company that sells chocolate products in U.K., Ireland, Middle East, Pakistan, India, and North Africa. The company is seeking to enter into Canada’s Market. This paper will present a market plan for Galaxy to enter the Canada market. In this market plan, a description of the company will be prepared and the strategic focus and plan including the core values, mission, and objectives that the company will have. The plan will also have the market analysis. The market…

Words: 1756 - Pages: 8
• ###### Comparative Study of Wegmans’ and Giant's Management Styles Essay

to new members (Louis, 1980). A review of two long-time super grocers, Wegmans and Giant, suggests that an organization's culture develops to help it cope with its environment. Wegmans’ has a defined culture that is visible in all aspects of the business and can be considered a major attribute to the organization’s economic success. Giant does not have a defined culture and the result is evident in dissatisfied employees and difficulties with organizational transformations. The success of an implementation…

Words: 6668 - Pages: 27
• ###### Essay Kraft Foods

Table of Contents Executive Summary 3 Introduction 3 History 4 SWOT Analysis 5 Global Market Expansion 7 Competitor Analysis 9 Industry Analysis 11 Recommendations 12 Conclusion 14 Exhibits 15 Bibliography 16 Executive Summary History Kraft Foods began in the year 1903, when James Lewis Kraft purchased wholesale cheese and began to sell it to stores in Chicago, Illinois. Later on James Lewis Kraft along with his four brothers, Charles, Fred, Norman, and John, start the…

Words: 3116 - Pages: 13
• ###### Market Analysis Essay

Executive Summary This marketing plan is a means for Elite Fitness to refocus its identity as differentiated from competitors in its local market. The primary goal for Elite Fitness is help achieve a healthy community by focusing on lifestyle fitness. This will involve rebranding, refocusing activities, and redeveloping many marketing materials in the coming 12 months. Follow up and careful examination of results over the next three years will determine whether this marketing direction is having…

Words: 2598 - Pages: 11