Osmosis in Potato Cells

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Ben Zaré 9MK Biology Investigation - Osmosis in Potato Cells 9/7/04

Section 1 – Planning

Aim
What is the aim of your experiment? What do you want to find out?
The aim of this experiment is to investigate how potato tissue changes when placed in sucrose solution of different concentrations. Therefore, I want to find out if and how osmosis differs, when the concentration is changed.

Variables
What is the variable you are going to change in the experiment?
The input variable of this experiment (i.e. the variable to change) will be the concentration of sucrose solution present in the test tubes, which the potato samples will be placed into.

What is the variable you are going to measure in your experiment?
The output variable of this experiment (i.e. the variable to measure) will be the mass and length of the potato sample, before and after osmosis has occurred.

What are the other variables in your experiment? How can you keep them constant?
The variables to be controlled in this experiment are: the total amount of sucrose solution used, the size and shape of the test tubes used, the type of water used (in this case, it will always be distilled), the potato tuber used to collect potato samples (for one particular set of results), the length and circumference of the cork borer used the type of weighing machine used (i.e. how many decimal places it measures to).

Apparatus
What apparatus are you using? What is this piece of apparatus for? How does it work? Why did you choose it? How accurate is it?

• A potato tuber of a certain size and variety, to obtain all of the potato samples for one particular set of results.
• A cork borer to obtain samples of a certain circumference from the potato tuber, which can then be cut to a uniform length.
• Test tubes (6 for each set of results) to store the distilled water and sucrose solutions (of different ratios) in, after they have been measured out correctly. Then the

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