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How do different concentrations of sucrose solution effect potato tissue?

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Introduction

Background Information Osmosis is the movement of water molecules though a partially permeable membrane from an area of high water potential to an area of low water potential. The membrane lets small water molecules pass though but not large ones. The flow continues until the concentration becomes the same on the inside as on the outside. This is called equilibrium. Molarity is a measure of contestation. Aim How do different concentrations of sucrose solution effect potato tissue? Prediction Based on my background information, I predict that the potato will change in mass and in length. I believe this because each Molarity of sucrose will change the potato's water content. This will happen because either the concentration will higher in the sucrose and lower in the tubers or lower in the sucrose and higher in the tubers. ...read more.

Middle

cut 30 pieces of potato to 1 cm length using a ruler and knife, and weigh each ones starting mass * I will put 25 cm3 of the 5 different sucrose solutions into 30 test tubes and add all the 1 cm potato cuttings into the solutions * I will then add these into the rack * I will leave for 15 minutes * Now I will measure the ending length and mass * I will add this information into the table created at the start and compare the results Preliminary Results After we did the Preliminary test we decided to use 1 cm long 4 mm diameter tubers. We would put them in 25 cm3 sucrose solutions. ...read more.

Conclusion

Conclusion My results show that as you increase the sucrose solution consecration the weight of the potatoes tuber goes up. This is because the water potential inside the tissue is lower than the sucrose solution; this means water passes though the partial permeable membrane into the cell. The result showing the length of the tuber did not show a distinct pattern this may be because we could only measure to one decimal place. You can be more accurate with a top pan balance because it goes to two decimal places and it is digital not analogue like a ruler. Results Graphs Dave Richens Osmosis Investigation Coursework Page 1 of 4 ...read more.

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Here's what a teacher thought of this essay

3 star(s)

An average write up, although the results are not very accurate due to the potato not being left for long enough. A results table has been left out with is unhelpful when trying to anaylse results. 3 stars.

Marked by teacher Louise Star 10/04/2013

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