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Potato and osmosis Investigation.

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Introduction

GCSE Biology- Osmosis Coursework Potato and osmosis Investigation Planning Aim: To investigate the osmotic activity which occurs when the concentration of a certain sugar solution is varied and the effect this has on potato chips. I must conclude this investigation by verifying the connection with the water potential/concentration of solution on potato chips (if there is one). Hypothesis: Osmosis is defined as the net movement (diffusion) of water or any other molecules or solutions from an area of high concentration to an area of low. This movement must take place across a partially permeable membrane such as a cell wall, which lets in smaller molecules like water but does not allow bigger molecules to pass through. The molecules will continue to diffuse until the area in which the are found reaches a state of equilibrium, meaning that the molecules are randomly distributed throughout an object, with no area having higher or lowers concentration than any other. Osmosis makes plants cells swell up if there're surrounded by weak solution ad they become (Turgid). This is real useful for giving support to green plant tissue and for opening stomata guard cells. Animal cells don't have a cell wall and can easily burst if put into pure water because they take in so much water by osmosis. ...read more.

Middle

The time left in the solution was approximately 30 minutes so I cleverly decided to measure the potato chips in the same order that they were originally placed. The surface area of the potato chips, this must be the same because the amount of surface area exposed to the solution may affect the rate of osmosis. The thickness of the chip would already be the same so I just cut the length so that each chip was equal. I had to use a ruler to measure the height after each chip was cut and tested. I made sure I used the same one every time and the same units on the basis of making sure my results would be accurate. 1st 2nd 3rd 4th 5th Distil H2O 2. 1 2.0 2..1 2.2 2.0 10% 1..0 1..9 2.0 2.0 2..1 20% 2.1 1.8 1.8 2.0 1.8 30% 1.9 1.8 1.9 1.8 1.8 40% 1.9 1.7 1.8 1.8 1.8 These preliminary results gave me an overall impression on the change in height loss when placed in varied concentrations of sugar solutions. Final Results: average 1.08 2.0 1.9 1.84 1.80 Planned method I was supplied with all the necessary equipment needed to perform the experiment so all I had to do was arrange them and prepare everything else. ...read more.

Conclusion

I had to at all times be aware of the restrictions which were present such as time, equipment and following careful instructions. I do think the experiment was very successful as we obtained a large number of accurate results. I think hat it was a fair test, however if i were to repeat the experiment I would have measured the water instead of approximating. I could also have repeated the experiment so i had a set of preliminary and then final results which i could compare or merge. I could have possibly used cloned potatoes which were all the same or altered the shape i cut them for example into doughnuts because cells in the centre may have a different capacity of water, intake, distribution or different water potentials. To be even more definite i could have used a machine to cut them. I am pleased with my results but there is definitely room for improvement. The thing i found most difficult was pouring the solutions into the test tube and making sure that they were all the same height. My overall evaluation of the experiment is that i think it will be very beneficial and good practice for future experiments. I did have a few anomalous results but the rest were all accurate. Gcse Coursework Osmosis Potato and osmosis Investigation Roy Vivasi Dr Amechi ...read more.

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