CHAPTER I INTRODUCTION 1.1 Background Food is one of human sources of calorie‚ protein‚ fats‚ and nutrition. Yet‚ because of the highly nutritious content‚ food is susceptible to growth of microorganisms. By the presence of microorganisms in food‚ the food is more likely to have shorter shelf life. Thus‚ mostly it is resolved by the addition of antimicrobial substances to food‚ such as condiments and preservatives. Condiments and preservatives could inhibit the growth of microorganisms
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Plasmolysis in Rhubarb Epidermis Cells Aim: To see if rhubarb changes when it is placed in solutions of different concentrations. Introduction: "Plasmolysis in Rhubarb Epidermis Cells" is an experiment to see whether or not rhubarb changed its cell structure when placed within different types or solutions. "A single layer of plant cell is placed on a micrscope slide and either distilled water or 5% NaCl solution is added to the cells. Osmosis will occur resulting in either turgid cells or
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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
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This indicates that solution X is isotonic because the concentrations are similar‚ resulting in no difference in appearance. Solution Y is hypertonic because it shrank the membrane in plasmolysis‚ which forced all of the chloroplasts to the center of the cell. The cell possessed a higher concentration of water than the solution‚ which expelled all of the water in the cell‚ causing it to shrink. Solution Z is hypotonic because of the visible
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concentrations. In this lab‚ we will determine the effects of hypertonic‚ isotonic and hypotonic solutions on plant and animal cells. In general when an animals cell’s placed in hypertonic solution it shrivels; a plant cell on the other hand undergoes plasmolysis. When an animal cell’s placed in hypotonic solution‚ it begins to swell and then finally lyse; a plant cell placed in this type of solution however‚ is said to be turgid. In isotonic solution‚ the animal cell stays the same (normal) whereas the
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Osmosis Lab: Potatoes and Elodea Background Information: Cells have a need to regulate their internal environment. They need to be able to this because cells often find themselves in environments where the concentration of dissolved solids outside the cell is different from the number of dissolved solids inside the cell. Since the solids can not move across the membrane‚ the cell responds by moving water either into or out of the cell in an attempt to balance the number dissolved particles.
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ii. hypertonic solution: A cell placed in it will lose water: Also known as plasmolysis. iii. isotonic solution: A cell placed in it will neither gain nor lose water 10) Cells of Plants‚ fungi & bacteria: Contain both plasma membrane & cell wall. Cell wall is rigid‚ non-living & outer most covering‚ composed mainly of cellulose. 11) When placed in hypertonic solution‚ a living plant cell shows plasmolysis 12) Cell wall provides mechanical strength to the cell. It permits the cell
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results in water molecules entering a plant cell‚ the molecules exert a pressure against the cell wall‚ called turgor pressure. 3. hypertonic‚ plasmolysis : hypertonic solution has a higher solute concentration than the cytosol of a cell. In a hypertonic solution a plant cell will lose water and shrink away from the cell wall‚ a process called plasmolysis. MULTIPLE CHOICE 1. d 2. b 3. a 4. c 5. b SHORT ANSWER Answer the questions in the space provided. 1. What happens to the movement
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Experiment to Investigate Osmosis in Potatoes The aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain what osmosis is. 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. This definition contains three important statements: a) It is the passage of water through a semi permeable membrane
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Guidelines for writing laboratory reports Laboratory reports should be written according to the format below (failure to do so will result in marks being deducted): Formatting Font Type: Times Roman Font size: 12 Spacing: 1.5‚ justified Pages : 5 (minimum) - 10 (maximum) [pages must be numbered] Title page You are required to use the lab report submission page available on the LMS and are to include these details: lab no.‚ title of experiment‚ students’ names and ID‚ date of experiment as well
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