The experiment i will do is to find the water potential of a potato, by putting potato pieces into different solutions of salt of known concentrations, until i find the concentration where the potato piece stays the same size. The points above the line may be excessively far away from the line this is because osmosis moves from higher water potential to lower water potential. The readability could be improved if some of the key information was in the form of tables rather than long paragraphs of text. Eventually, the cell stops swelling, and when this point is reached, we say the cell is turgid. It would help to include more selected background reference material to help inform the plan.
The problem is that i might have dried one potato piece much more than the another piece Buy now Gcse Biology Osmosis Coursework Evaluation
To insure that this wouldnt be a problem, i think tissue shouldnt be used to dry however appropriate drying equipment should be used. . The dependant variables i have chosen to measure are the mass of potato chip after osmosis and the volume of solution remaining after osmosis. Surface area is a big factor of osmosis as it means there is more of an area to take in or release water molecules, meaning that osmosis should the variable i have selected as my independent variable is the concentration of sucrose solution that the potato chips will be placed in. I then the tissue paper to dry the potato lightly.
I put these pieces of potato on a piece of tissue and left them on the side. For example, i need potato pieces of the same size, and should always use the same volumes of salt solutions Gcse Biology Osmosis Coursework Evaluation Buy now
I then put one piece of potato into a test tube, the potatoes stayed in the solution for approximately 20 hours. Created by teachers, our study guides highlight the really important stuff you need to know. Variables the independent variable in my experiment was the surface area of the pieces of potato. Pure water has the highest water potential, which is 0. However, if you put a piece of potato into a strong salt solution (where the water concentration is low), then water will move out of the potato.
Biology project ? The stem cell research question 5 ? Argument for stem cell research. I then mixed all the solutions, putting the required amounts of sucrose and water. This defeats the whole object of this experiment in which you are meant to find out the mass after water molecules have been moved around Buy Gcse Biology Osmosis Coursework Evaluation at a discount
Investigating the effect of changing the concentration of an acid on the rate of. Proximity of the graph points to the best fit line the points on my graph are somewhat far away from best fit line- they are a maximum of 2. . Relating this to the potato chips basically, as the concentration of salt in each solution increases, the water in that solution is less able to move to the potato, causing water from the potato to move to the solution, decreasing its length, weight and width. The evaluation could have been improved by making the suggestions for improving the method or range of the work more specific.
To improve the reliability, i would do more repeats. Therefore the shape and the mass of plant cell would stay the same Buy Online Gcse Biology Osmosis Coursework Evaluation
Osmosis is established when a semi-permeable membrane is placed beween two solutions. This will ensure that reliability of results are very high as if there is a faulty result, it would stand out clearly if there are more repeats. I then put one piece of potato into a test tube, the potatoes stayed in the solution for approximately 20 hours. Eventually, the cell stops swelling, and when this point is reached, we say the cell is turgid. The water molecules also move through a partially permeable membrane.
Therefore the molecules of water would pass from the pure water through the cell walls and into the cells of the potato. Created by teachers, our study guides highlight the really important stuff you need to know Buy Gcse Biology Osmosis Coursework Evaluation Online at a discount
To make this experiment a fair test, i would need to keep everything else constant as far as possible. An example of this in my results is the test at 1 molar. The first measurement i took was the mass of the potato before it was put into the solution. I put these pieces of potato on a piece of tissue and left them on the side. Also if you put in too much or too small, it was hard to sort out as you dont know whether to add more distilled water or sucrose solution.
This is due to the fact that the cell walls are made from cellulose, which is extremely strong. Relating this to the potato chips basically, as the concentration of salt in each solution increases, the water in that solution is less able to move to the potato, causing water from the potato to move to the solution, decreasing its length, weight and width Gcse Biology Osmosis Coursework Evaluation For Sale
Using a marker, label each of the five potato cylinders (from numbers 1-5) that are to be placed in each beaker. In other words, it becomes dehydrated and loses water through plasmolysis. Firstly i used the cork borers to get the eighteen samples of potato tissue. Getting the right ratio of distilled water and sucrose solution was very difficult. After the potato tissue had been in the solution for the required amount of time i measured the mass again.
The water molecules can move because they have kinetic energy and they can move randomly. A very clear account showing a detailed understanding of osmosis written using a good standard of gcse level biological terminology. All the masses of the potato were measured in grams, to 3 decimal places For Sale Gcse Biology Osmosis Coursework Evaluation
The water molecules can move because they have kinetic energy and they can move randomly. Using a marker, label each of the five potato cylinders (from numbers 1-5) that are to be placed in each beaker. A trial experiment was used to help inform the plan and a good range of the independent variable was selected. Even though the volume does not influence the concentration, the volume should be kept constant in order to maintain a fair test. Time for which potato chips are kept in each solution all the trials will be kept for 24 hours if the potato chips are left for potato chips should have about the same amount of water inside them and should all have about the same sized surface area.
If the concentration of the salt solution (in our case glucose solution) outside the cell is less than that inside the cell, this means that the solution is hypotonic to the cells of the potato chip Sale Gcse Biology Osmosis Coursework Evaluation