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Effect of osmosis plant cells
Effect of osmosis plant cells
Potato sugar content investigation
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... els of sucrose solution to distilled water (see molarity table above) and I placed each of the mixtures into the correct beakers. 5. Then I weighed all the potato chips on an electronic balance (see results) and recorded the results. 6. I placed 5 pieces of potato into each beaker and left them for approx 36 hrs. 7. After this time I drained out the solutions from the beakers and I carefully placed them in order of molarity on a paper towel. 8. I dried the potato chips gently and then weighed each potato piece and recorded the results. 9. As I had extra time I made a second experiment and also recorded those Results: Molarity (M) Starting Weight (g) (Results 1) Final Weight (g) (Results 1) Percentage Change (%) (Results 1) Start Weight (g) (Results 2) Final Weight (g) (Results 2) Percentage Change (%) (Results 2) These values clearly support my prediction, and even though there are some anomalous results, there is an overall negative trend across the whole set of results, proving them accurate. Analysis of Results: The sucrose concentration of the solution into which the potato tissue is placed affects to what degree it grows or shrinks. As you can see from the graph the results show a clear negative correlation, a very obvious inversely proportional trend. From this a conclusion can be drawn. When the water concentration is high, the potato gains water, as seen by the 0.0 molarity solution. When the water concentration is low, the potato loses weight and therefore decreases in mass, as seen in the 1.0 concentration solution. This proves my hypothesis correct. The results were quite widely ranged, as seen on the graph, wit ......
Aim: To see how concentration affects osmosis on a potato.
Plan: I will first make a prediction using the knowledge I have on osmosis and I will then carry out the investigation to prove whether concentration affects osmosis in a potato. Using my results I will then try to find a pattern and prove my prediction to be correct or incorrect. After I have done that I will try and find ways in which I could improve the experiment and extend the investigation.
Method: First we will cut out 18 pieces of potato¡¦s from the same potato using a borer so that we have all the potato strips at the same length and same mass.
Considering the fact that Marc has both been sweating and drinking minimal amounts of water, Marc is now dehydrated. This means he has less than the required amount of water for his body to complete the processes necessary to maintain its health. As stated in the question, the process of sweating causes the loss of more water than solutes. This means that as the level of water decreases, the level of solute concentration will increase, creating a change in the water to solute ratio.
Osmosis and Diffusion Investigation Aim: To examine the process of osmosis and diffusion. Part A: Step 1: Q1.[IMAGE] Q2. The jiggling motion is visible because the fat globules are constantly being bombarded by smaller particles. [IMAGE] Q3.
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Osmosis Experiment Planning Aim: The main subject that I will be planning to investigate is the effects of a concentrated sucrose solution on potato cells on the basis of the Osmosis theory. Background knowledge: The plant cell and its structure To understand osmosis in detail I will need to explain the plant cell (which is the cell included in the osmosis experiment) and its cell membrane. Below I have a diagram of a plant cell: [IMAGE] Osmosis is about the movement of particles from a higher concentrated solution to a lower concentrated solution to create an ethical balance via a partially or semi permeable cell membrane. Osmosis in simple terms is the exchange of particles between the cytoplasm inside the cell and the solution outside the cell. What makes this exhange is the partially permable cell membrane.
The purpose of this experiment is to investigate the effect of changing the concentration of sodium chloride solution on the rate of osmosis in tubes of potatoes. This was maintained using equal measurements of the potato tubes and applying them into the different concentrations of sodium chloride, 0%, 2%, 5%, 10%, 20% and 26%, in beakers then measuring the change in mass of the potato tubes afterwards. The time taken for all potato tubes to be placed in solution was 15 minutes. Can the concentration gradient of the sodium chloride solution influence on the rate of osmotic diffusion undergone by the potato tubes?
Osmosis is the facilitated diffusion of water across the cell membrane of a cell. The inside layer of the cell membrane is hydrophilic, meaning water cannot easily pass through the membrane. The cell membrane has to have aquaporins, which are water channel proteins, that move the water across the membrane. If there is a water and salt solution outside the cell, the salt can enter the cell by diffusion, but the cell membrane is not permeable to the water. Because there is more solute solution inside the cell, there is less water. The aquaporins move the water across the membrane until equilibrium is reached.
If the concentration of sucrose increases, then the mass of the potato will decrease. However, if the concentration of the solution in the beaker is less than that of the potato (such as distilled water), then the mass of the potato will increase. So, as the concentration of sucrose increases the rate of osmosis increases.
The Functions of Osmosis Osmosis is the passive transport of water through a selectively permeable membrane, a membrane that allows certain needed particles to pass through it more easily than others. Pores in this type of membrane are large enough for water to pass effortlessly through it. The flow of water during osmosis depends on the concentration of a solute either within a cell membrane or surrounding the membrane. Water naturally flows from a hypertonic solution, an area of high concentration of solute, to a hypotonic district, a solution containing a lower concentration of solute.
Conclusions: There is a pattern on the graph, and data table, which shows that as the concentration of the sucrose solution increases, the potato's percentage change in mass decreases.
Various sizes of potato cores may cause a change in the data because different sizes may be able to absorb more or less salt concentrated water, resulting in an inaccurate mass measurement. A solution to this could be a different method to cut the potatoes so that they’re equally sized for more accurate data, possibly by using a vegetable slicer or something of the sort. Another thing that could have affected the data is the plastic wrap. We covered our cups with plastic wrap, but it didn’t stick very well to the cups. This made it so that our cups were not securely covered, and the amount of air that was able to leak into the cups over the 24 hours may have affected the results. Perhaps we could’ve used stickier plastic wrap, or maybe used rubber bands as well to secure the plastic wrap
- The nurse’s mistake will increase the saltiness due to the double amount of saline in the bag.
== = This experiment is based on the concept of Osmosis. Osmosis is the diffusion of water molecules from a region of high water concentration to a low water concentration through a semi permeable membrane (in this case, the cell potato cell membrane). The cell walls of the potato cells are semi permeable meaning that water molecules (which are small) can fit through but other bigger molecules such as glucose cannot pass through. The water molecules can flow both ways through the membrane, letting molecules both in and out.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
Experimental Strategy: In this experiment, the yeast being used is called Saccharomyces cerevisiae. This type of yeast follows fermentation which is very unique and can tell how much carbon dioxide is produced by fermentation more accurately compared to cellular respiration. Three test tubes will be filled with a specific volume and concentration of sugar with a certain amount of yeast in each test tube. Two of the three test tubes will have similar concentrations of sugar with different amounts of yeast...
Prediction I think that when the potato is placed in distilled water the potato mass will increase. This is because water, has, if pure, a weaker concentration than the potato, and the water molecules move in through a partially permeable membrane by osmosis. If the potato is in a high concentration salt solution, the potato mass will decrease because the potato is less concentrated than the salt solution, and the water will move through the partially permeable membrane into the stronger solution. However, if the potato mass stays the same after the experiment, this means that the water/salt solution and the potato must be of equal concentration.