Biology Unit 1 - Cell Transport - Required Practical. 5.0 / 5 based on 1 rating ? BiologyCells, tissues and organsGCSEAQA Created by: 07km04Created on: 02-06-17 09:54 Step 1. Cut up a potato into identical cylinders. 1 of 12 Step 2. Collect beakers with different sugar solutions in them, one being pure water and the other being very concentrated. 2 of 12 Step 3. Measure the mass of the potato cylinders. 3 of 12 Step 4. Leave each potato cylinder in each beaker for 24 hours. 4 of 12 Step 5. After 24 hours, take the potato cylinders out and measure them again. 5 of 12 Conclusion: 1 If the potato cylinders have increased in mass then they have drawn in water through osmosis. 6 of 12 Conclusion: 2 If the potato cylinder has decreased in size then water has been drawn out by osmosis. 7 of 12 The dependant variable (what you measure and what is affected): Potato cylinder mass. 8 of 12 Independent variable (what is changed or controlled) Concentration of sugar solution. 9 of 12 All other Variables must be kept the same: Volume of solution, temperature, time, type of sugar used etc. 10 of 12 Errors that could occur: Excess water on the cylinders would increase mass. 11 of 12 How to increase accuracy: Repeating the experiment and calculating a mean percentage change. 12 of 12
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