Biology Unit 1 - Cell Transport - Required Practical.

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  • Created by: 07km04
  • Created on: 02-06-17 09:54
Step 1.
Cut up a potato into identical cylinders.
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Step 2.
Collect beakers with different sugar solutions in them, one being pure water and the other being very concentrated.
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Step 3.
Measure the mass of the potato cylinders.
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Step 4.
Leave each potato cylinder in each beaker for 24 hours.
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Step 5.
After 24 hours, take the potato cylinders out and measure them again.
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Conclusion: 1
If the potato cylinders have increased in mass then they have drawn in water through osmosis.
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Conclusion: 2
If the potato cylinder has decreased in size then water has been drawn out by osmosis.
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The dependant variable (what you measure and what is affected):
Potato cylinder mass.
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Independent variable (what is changed or controlled)
Concentration of sugar solution.
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All other Variables must be kept the same:
Volume of solution, temperature, time, type of sugar used etc.
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Errors that could occur:
Excess water on the cylinders would increase mass.
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How to increase accuracy:
Repeating the experiment and calculating a mean percentage change.
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Other cards in this set

Card 2

Front

Collect beakers with different sugar solutions in them, one being pure water and the other being very concentrated.

Back

Step 2.

Card 3

Front

Measure the mass of the potato cylinders.

Back

Preview of the back of card 3

Card 4

Front

Leave each potato cylinder in each beaker for 24 hours.

Back

Preview of the back of card 4

Card 5

Front

After 24 hours, take the potato cylinders out and measure them again.

Back

Preview of the back of card 5
View more cards

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