In this experiment I am intending to investigate the concentration of
sugar in the cell sap of a potato-cell's vacuole. I will discover this
using my knowledge of the biological process of Osmosis.
Osmosis is the movement of solvent (usually water) through a
semi-permeable membrane separating solutions of different
concentrations. The solvent passes from a more concentrated solution
to a less concentrated solution until the two concentrations are
Many cell membranes behave as semi-permeable membranes, and osmosis is
a vital mechanism in the transport of fluids in all living organisms,
the transport of water from the roots up the stems of plants is just
one of these.
[IMAGE]For this experiment I will need the following apparatus:
1. One large potato,
2. [IMAGE]Five glass beakers,
3. One measuring cylinder (50ml),
4. One potato corer,
5. [IMAGE]One dissection tile,
6. One scalpel,
7. One measuring scale (2dp)
8. [IMAGE]Ruler (1dp).
To discover the concentration of sugar in the cell sap I will place a
piece of potato, exactly 2.5cm in length, in a beaker of salt solution
(varying in strength) and leave it for 24 hours. If the piece of
potato increases in weight, the concentration of water in the solution
is too low, therein, if it decreases in weight the concentration of
water in the solution is too high. But if there is no change in weight
whatsoever then the concentration of water in the solution ...
... middle of paper ...
... weight because there is a high difference between the concentration of
water inside the cell and the concentration outside the cell.
I believe the potato will greatly decrease in weight because water is
now at a much higher concentration inside the cell than outside.
Therefore, due to Osmosis, the water molecules will move from where
they are in high concentration to where they are in low concentration:
leaving the cells and entering the solution.
Collection of Results
To be sure that my results are collected and recorded in the correct
manner, one which is easy to both understand and compare, I have
constructed four results tables which can be seen overleaf. I have
crated a separate table for every experiment and one in which I can
record the average result of each aspect of those experiments.
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