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  • Level: GCSE
  • Subject: Science
  • Document length: 657 words

Osmosis In A Potato.

Extracts from this essay...


Osmosis In A Potato Intro: My biology coursework is based round the osmosis process that takes place in potatoes. Osmosis is the intake of a salt solution through a selectively permeable membrane. The strength of a salt solution can have a dramatic difference on the amount the potato can take in, and how it reacts. Here is an example of a selectively permeable membrane... Variables: An fundamental necessity in my biology experiment is to decide which variable I am going to use and modify. A variable is an aspect of the experiment which can be modified in order to change the outcome of the entire osmosis experiment. Below are the variables I have available * Temperature * Solution Strength * Size Of Potato * Weight Of Potato After a lot of careful deliberation I have decided to use the solution strength as my variable.


Fair Test: To make sure my experiment is fair I will stand by the following guidelines... * Use the same sized test tube. * Make sure each strength is measured exactly. * Make sure each piece of potato is exactly the same size as the next. * Make sure I double check every measurement Prediction: For my experiment I am going to make a prediction, that will test all the theory I know regarding Osmosis. After researching into the state of osmosis I predict that as the strength of the solution increases the size of potato will rapidly increase, as liquid is removed from the potato and released into the salt solution.


Evaluation: Personally I think the experiment went very well, I made sure that I followed the plan and method to the letter and made sure it was a fair test enabling me to get exact results for each potato and strength of solution. By getting my results I was then able to verify whether my prediction was correct and prove this, using graphs and result tables. I think there could only be thing that I might be able to change in my experiment and that is the amount of potatoes used in each test tube or even run the experiment twice, this would enable me to gain more results and further verify my prediction. ?? ?? ?? ?? Page 1

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