Essays on Osmosis

Osmosis: Potato and Sucrose Solution
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Investigation of Factors Affect Osmosis in Potatoes Aim The aim of the following experiment was to investigate the effect of  varying the concentration of sucrose solution on osmosis in a potato. Preliminary Experiments One preliminary experiment was done before the main experiment. From  the preliminary, we were trying to find out how osmosis actually  occurred in potatoes, and gave us a vague idea on what the main  experiment would be like. This preliminary will aid my prediction, which is stated…...
How the mass (in grams) of potato tissue changes when placed in varying concentrations of Sucrose?
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Pages • 9
The aim of this experiment is to find out how the mass (in grams) of potato tissue changes when placed in varying concentrations of Sucrose. Apparatus: Cutting tile - to cut the potato on Knife - to cut the potato Graduated pipette - to fill the bottles 25cm Measuring cylinder - to measure solutions Distilled water - to act as a control The following Sucrose solutions 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 molar concentrations -…...
Investigating the Water Potential of Root Vegetables
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For my experiment I will be investigating the water potential of root vegetables. The vegetable I am going to use is turnip. I am going to use turnip because it is a uniform vegetable. This investigation is about osmosis. "Osmosis is the net movement of water molecules from an area of high water potential to an area of low water potential. This takes place through a partially permeable membrane." Water potential is the potential energy of the water molecules on…...
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Find out what affects the rate of Osmosis
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Pages • 6
My Aims * I am aiming to find out what affects the rate of Osmosis. * To do this I am going to use temperature as a variation and my aim is to use it successfully. Prediction I predict that the warmer the water, the faster the rate of Osmosis occurs. I believe that Osmosis will occur when the water is at 10 but when the water temperature increases to higher temperatures e.g. 50 I believe a greater amount of…...
Biology Coursework
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To investigate and find the water potential of baking potatoes and sweet potatoes in (N/mm2) using various strength solutions of sucrose (mol) Hypothesis I believe that the baking potatoes will have a less negative water potential. In the experiment they will not increase in mass at a lower of sucrose molarity than the sweet potatoes. Baking potatoes contain more water than sweet potatoes. This is clearly obvious, cut a baking potato into cubes and it releases a lot of water,…...
Investigating the Difference in Isotonic Point in Sweet and White Potato
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To observe whether equal sized white potato or sweet potato cores reached the isotonic point in the same concentration of sucrose solution. Introduction: Osmosis is diffusion of water from areas of high water potential to areas of low water potential. It does not require an input of energy. Plants use osmosis to transport minerals from their roots to their leaves, and to take in water in the soil. Because the plant cell is taking in water and minerals, its mass…...
Bioilogical Experimentes
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Diffusion and osmosis are very important in biological process. Diffusion is the movement of molecules or ions from a region of their high concentration to a region of their low concentration. Osmosis is the diffusion of water molecules across a semipermeable membrane. To gain a better understanding of diffusion and osmosis, we examine multiple experiments to show diffusion and osmosis in animal cell, plant cell and synthetic cell. In our first experiment, we weight a decalcified chicken egg and place…...
Osmolarity: Concentration and Sucrose Solutions
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My group and I conducted the experiment that estimates osmolarity by change in weight of potato tubers, this was conducted in order to explore the process of diffusion and osmosis and more importantly to investigate the question of “Does different concentrations of sucrose solutions have an effect on the final weight for the potato tubers?” In this experiment we estimated the osmolarity of potato tuber cores by submersing different potato cores into sucrose solutions of 0.0-0.6M, and weighing the potato.…...
Osmosis Lab Report
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Abstract: The objectives of this lab was to be able to create models of cells with the dialysis tubing to show us how the plasma membrane is selectively permeable, to study the effects of osmosis on a model cell, and to foresee the effect of solute concentration on osmosis. In order to achieve these objectives, we had to fill the dialysis tubing with either water, or different amounts of sucrose. We then tied off the tubes and put them into…...
Passive and Active Cell Transport Mechanisms
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The cell is invaluable building block of all biological life on this planet, and one of its most important and unique characteristics is its ability to be selectively permeable with its plasma membrane. This outer membrane’s sophisticated mechanisms of transport through its bilayer are vital in maintaining homeostasis in the cell and the entire body. To further understand these mechanisms, which can be further described as passive and active transport, five experiments were conducted. These tests were done over simple…...
Cell Transport Mechanisms
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Describe two Variables that affect the rate of diffusion. The two variables that affect the rate of diffusion are: A. The size of the molecule. The larger molecule will diffuse more slowly than the smaller molecule. B. The nature of plasma membrane. If the membrane is composed of lipid portion., only lipid soluble molecules can pass through while water molecules cannot. 3. Why do you think the urea was not able to diffuse through 20 MWCO? How well did the…...
Red Onion Cell Lab
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The passage of water molecules through a selectively permeable membrane is a special case of diffusion known as osmosis. Osmosis results in the movement of water from an area of lower concentration of dissolved material to an area of higher concentration of dissolved material. For a demonstration of this principle, a purple onion cell is going to be bathed in different concentrations of salt (NaCl) water. Problem: How do solutions of various salt concentrations influence osmosis in relation to an…...
Osmosis & Diffusion
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Kinetic energy, a root of energy stored in cells, causes molecules to hit into each other and move in new directions. Diffusion is the result of this contact. Diffusion is the random movement of molecules to an area of lower concentration from an area of higher concentration. Osmosis is a type of diffusion. This is the diffusion of water through a selectively permeable membrane from a region of higher water potential to a region of lower water likely. Water potential…...
Osmosis Case Study
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These two Case Studies come from a National Center on Case Studies. I think that a case study approach is very useful in applying knowledge and this is what makes you learn it better. They may be a little daunting when you read them but I will help you go through them. Please ask for help so this topic becomes more enjoyable for you. Part I—Too Much of a Good Thing Times were difficult in Habersham County. The skyrocketing prices…...
Case StudyOsmosis
Cell Transport
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There are two types of cell transport mechanisms. These types of transports are passive and active transport. The difference between active and passive is that passive does not require energy and active does require energy. The reason passive does not require energy is because it travels down a concentration gradient. On a concentration gradient molecules naturally move from high to low concentration. In active transport, molecules move from low to high concentration. There are three different types of transports for…...
Osmosis and celery lab experiment
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Diffusion is simply the net movement of atoms or molecules from a region of higher concentration to a region of lower concentration. The force behind the movement is heat or kinetic energy (also called Brownian motion). Diffusion occurs when you spill water on the carpet floor and it spreads out, or when you open a bottle of perfume and it leaves the bottle and spreads throughout the air in the room. Osmosis is a similar phenomenon that moves water from…...
Scientific Critique of “Osmosis Jones”
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SYNOPSIS The 2001 film, "Osmosis Jones", focuses on the representation of the human organism and the daily conflicts a body faces in order to maintain function. The film "Osmosis Jones" is a film that tries to capture the attention of children ages eight to fourteen, by exposing the mechanisms of the human body. It is able to reveal the dangers of maintaining an unhealthy diet and some of the consequences that are associated by doing so. The film illustrates that…...
Cells Size Research
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This research assignment will discuss why cells are usually microscopic in size, given that they need to be able to exchange material with their surrounding environment. The cell is highly organised with many functional units or organelles (Spurger).A membrane is a fluid mosaic which consists of proteins, lipids and carbohydrates which seperates the cell from it's surrounding environment or subdivides a cell into specialised regions or compartments (Watters). The membrane is specialised in that it contains the specific proteins and…...
Osmosis and Selectively Permeable Membrane
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Introduction: Molecules have kinetic energy. This causes the molecules of the cell to move around and bump into each other. 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 ( Reece,…...
Effect of pH Levels on the Growth of Bean Plants
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Different pH level may affect the growth and development of the plants. Certain key words include: pH level, germination, acidity, osmosis and diffusion. This experiment examines the effects of different pH level of vinegar on the growth of bean plants. Materials used in this experiment consist of: water (pH 6), vinegar with the pH level of 3, 4 and 5 (each one were made before experiment), beans, soil, and pots. Eight bean plants were planted, two were watered with pH…...
Structure and function of plasma membrane in cells
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'The structure and significance of the plasma membrane discovered within and around all cells' The plasma membrane surrounds all eukaryotic and prokaryotic cells. Eukaryotic cells have membrane bounded organelles whereas prokaryotic cells do not. The plasma membrane forms the border between the cell cytoplasm and the environment. Its function are to permit various environments to be established inside and outside the cell. It also manages the movement of substances into and out of the cell. The cell surface membrane which…...
Blood GroupsCellOsmosisStructure
Osmoregulation in Fish
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Osmosis in the motion of water particles through a selectively permeable membrane. It happens from a region of high water concentration to a region of low water concentration. The control of water balance in animals is called osmoregulation. Osmoregulation is a homeostatic mechanism. The body fluids of a seawater fish are hypotonic (higher in water concentration) compared to the surrounding sea water - the sea water is therefore hypertonic. Due to the fact that of this they constantly lose water…...
Uses of water in living things
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To emphasise the sheer importance of water in living things and to put the content of this essay in to perspective, I am firstly going to inform you that the human body is approximately 50-75% water. Without water our body would be unable to successfully perform the numerous complex reactions and processes required for our functioning. Throughout my essay I aim to present to you several uses of water particularly focusing on the human body’s reliance on water to function.…...
GlucoseLiving ThingsOsmosisWater
Practical assesment about biology
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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 membrane, cell wall, creating a pressure on it known as water potential. The…...
Experiment to Investigate Osmosis in Potatoes
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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: It is the passage of water through a semi permeable membrane It is…...
Effects of Osmosis in Plants’ Cells
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Introduction Osmosis is a movement of water across a semi-permeable membrane. This may only happen when there is a difference in concentration between the two sides of the membrane. The water moves from low concentrations to high concentrations. That is because the low concentrated area tries to dilute the opposite via osmosis. The effects osmosis has on a cell are either that it becomes turgid and hard as water enters the cell or it becomes dehydrated (this is called plasmolysing…...
To investigate the effect to the potato cells in the different solute concentration water
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Water can move through the different cells due to the difference of water potentials in the cells. If there is a higher solute concentration in the cell than outside the cell, the water will move into the cell. However, if the concentration of inside the cell is lower than the outside, water will not move into the cell. This process is called osmosis. Research question; This investigation will determine how different concentrated sugar water will affect to the mass change…...
Determining the Osmolarity of a Potato
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Abstract Students in Biology find it difficult to understand the concept of tonicity and osmolarity in a real time situation. In this investigation, several concentrations of sucrose were used to determine the osmolarity of a potato. It was found that the concentration of sucrose was close to 3.6 in the potato used showing that it was isotonic. Anything above caused the potato to gain weight showing that it was a hypotonic solution and anything below caused the potato to lose…...
Membrane and Plasma in Plant and Animal Cells
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Discuss the structure of the plasma membrane and explain the process of active and passive transport through the membrane. Explain your observations in detail in terms of concentration gradient, diffusion, osmosis, osmotic pressure, passive transport, and active transport. Explain what happened to the blood cells at the various levels of concentration. Be sure to refer to the solutions as being hypotonic, hypertonic and isotonic The plasma membranes are made up of proteins that form pores and channels, cholesterol to provide…...
OsmosisPlant And Animal Cells
Egg Lab Report
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An egg is a design of a human due to the fact that the egg has a cell membrane like people do inside and beyond the body that let things pass through like water. We can utilize eggs to study the effect of changes in the external environment on the internal environment by having extreme environments like putting the egg in only alcohol and see what occurs to the within the egg. Diffusion is the movement of a compound down…...
Lab 4 Diffusion and Osmosis
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1. Diffusion and Osmosis, June 4, 2013 2. Purpose: The purpose of this laboratory is to help provide visual understanding of diffusion which is a service of high concentration spontaneously (no energy required) moving to an area of low concentration. Likewise having a look at osmosis, which is the motion of chemicals throughout the cell membrane. Osmosis needs some kind of energy to be put in for this to take place. After these experiments we should have a much better…...
Physics of Diffusion Across a Selectively Permeable Membrane
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Introduction Diffusion is movement of molecules from one area of concentration to another. This process is vital for the life functions of cells. Cells have selectively permeable membranes that allow only certain solutions to pass through them. Osmosis is a special kind of diffusion that allows water to go through semi-permeable membranes of high water potential to a region of lower water potential. Water potential measures the tendency of water to leave one place and into another. Diffusion and osmosis…...
Physio Ex 9.0 Activity 1 Cell Transport Mechanisms and Permeability
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ACTIVITY ONE- Cell Transport Mechanisms and Permeability: Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. Molecular weight affects the rate of diffusion because the bigger the size of the molecule the longer it will take to diffuse. Membrane size is another variable that affects the rate of diffusion because if the membrane’s pores are small it will take molecules longer to diffuse though it than if the pores were larger. Also, membrane thickness is…...
Osmosis and Diffusion
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The basic principles of Osmosis and Diffusion were tested and examined in this lab. We examined the percent increase of mass and molarity of different concentrations of sucrose in the dialysis bag emerged in distilled water and the potato cores emerged in concentrations of sucrose. The data reinforces the principles of Osmosis and Diffusion, and in a biological context, we can simulate how water and particles move in and out of our own cells. Introduction Objective: 1. Investigate the process…...
Chemicals IndustryDiffusionOsmosis
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FAQ about Osmosis

How the mass (in grams) of potato tissue changes when placed in varying concentrations of Sucrose?
...In trial 2 the last 2 results look weird. I think the reason for this is because my method was not good enough. When filling each of the test tubes with glucose, I did not use a measuring cylinder to measure the required amount. I just poured until t...
Find out what affects the rate of Osmosis
...I could improve my results by repeating the experiment several more times to work out a good average but we did not have the time to do this. I could take this experiment further by using more temperature variations to get a better picture and so bet...

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