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To investigate the effect of different concentrations of sucrose solution on plant tissue/cells

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Introduction

To investigate the effect of different concentrations of sucrose solution on plant tissue/cells By Karl Holland Safety During my experiment I will need to take the following safety precautions: * I will need to watch my fingers when I am cutting the potato into the desired shape. * I will have to be careful when I am carrying any glass beakers with wet hands so that I do not drop or let them slip from my hands. * If I spill any sugar solution or distilled water onto the floor I must clean it up or it may be dangerous as someone could slip on it and injure them selves. Background information This is a plant cell in its normal state This is a plant cell that has been placed in distilled water This is a plant cell that has been placed in strong sugar solution In my experiment this is what should happen to the cells. ...read more.

Middle

* I will place each piece of potato 1 in each of the 5 test tubes and leave for 30 minutes. I leave it there for 30 minutes so that osmosis has time to take place and give clear results. * After the 30 minutes I will take out the potatoes and reweigh them. I reweigh so that I can get the results needed to complete the experiment and work out the percent change. * Once I have obtained all my results I will record them and work out the percentage change in the weight, from before being placed into solution to after being took out of the solution. Apparatus Potato, 25ml of distilled water, 25ml of 0.2 molar sucrose solution, 25ml of 0.4 molar sucrose solution, 25ml of 0.6 molar sucrose solution, 25ml of 1 molar sucrose solution, measuring cylinder, cork borer, 5 test tubes, top pan balance and stop watch. ...read more.

Conclusion

Also to insure that my test is as fair and accurate as possible I am going to leave the potatoes in for the same amount of time, which is 30 minutes. Intended results table The results table I intend to use will be one that looks like this. 1st weighing (g) 2nd weighing (g) Percentile change (%) Potato 1 Potato 2 Potato 3 Potato 4 Potato 5 Prediction I predict that the potato piece that is placed in the distilled water will be the one that increases the most in weight. Where as the potato placed in the strongest sugar solution will be the one that decreases the most in weight. This will happen because osmosis will take place in the potato cells and the one in the distilled water will gain weight because the semi permeable cell membrane will let the water in. Where as the potato in the strong sugar solution will decrease because the strong sugar solution will cause the water in the potato cell to leave by osmosis. ...read more.

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Response to the question

The student has answered the set question very well and the whole essay is very well set out, although the technical terms and scientific reasoning in the essay are basic. Their responses are very clear and well set out, and ...

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Response to the question

The student has answered the set question very well and the whole essay is very well set out, although the technical terms and scientific reasoning in the essay are basic. Their responses are very clear and well set out, and they answered the set question well, showing reasoning behind their prediction and clear thinking as to the process and each stage of the experiment. I would liked to have seen more scientific reasoning behind what happens during osmosis and clearer links between membrane permeability and sucrose concentrations.

Level of analysis

They show analytical skills accurately and well for this level of qualification. Their prediction which is their evaluation of the experiment shows correct scientific understanding and analysis of the experiment, and this continues throughout the essay. An appropriate prediction conclusion has been reached based on the background given in the initial stages of the essay to what will actually happen in the experiment.

Quality of writing

The spelling is okay although uses 'insure' instead of the correct use 'ensure' in some places, also uses incorrect spellings elsewhere although these are rare and the meaning of the writing is still very clear. The grammar is fine and well communicated as is the punctuation. They follow conventions and expectations better than expected for this level of GCSE student, and although the technical terms are still at GCSE level, the outline of the essay shows high understanding of what the outline of scientific coursework at A level standard would look like.


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