Investigating the Effect of Different Solutions on Plant Cells

Investigating the Effect of Different Solutions on Plant Cells
The aim of my experiment is to find the effects of different solutions
on plant cells.

Osmosis is a form of diffusion, the movement of molecules to allow
them to mix, which occurs in plants. When a cell containing a weak
solution is next to a cell containing a stronger solution the water in
the weaker solution moves towards the stronger solution. This is why I
think that the pieces of potato in the concentrated solution will
decrease in both weight and length. However, I believe that the potato
will do the opposite and increase in length and weight.
I cut 15 identical pieces of potato, measured and weighed them, and
placed 3 in 0.25mol/l 3 in 0.50mol/l 3in 0.75mol/l 3 in 1.00mol/l and
3 in water inside a test tube. I ensured that each test tube had 10ml
of liquid surrounding the potato. I gave it 3 days before weighing and
measuring the potato again to see the difference. The reason behind
putting 3 pieces in the same level of concentration was to ensure a
fair test. I will ensure that amount of solution and length of potato
is the same because if they are different it will spoil the results of
the experiment. More concentration could cause weight differences and
length of potato could make it absorb more or less concentration than
other pieces depending on the difference in size. To ensure they are
the same I will use a measuring cylinder to measure the amount of
concentration I pour into each of the test tubes and I will measure
the potato as accurately as possible.

The equipment I will require is: 15 test tubes

2 test tube racks

A measuring cylinder

15 pieces of potato

30ml of each concentration

A ruler

Scales.

These were my results for length.

CONCENTRATION

INITIAL LENGTH

AVERAGE

FINAL LENGTH

AVERAGE

DIFFERENCE

MOL/L

0.25

2 2 2

2

2 2.2 2.1

2

0

0.50

2 2 2

2

2.2 2.3 2.1

1.8

-0.1

0.75

2 2 2

2

2 2.2 2.1

1.8

-0.2

1.00

2 2 2

2

2 1.9 1.8

1.7

-0.3

Water

2 2 2

2

2 2.2 2.2

2.3

0.3

These were my results for weight

CONCENTRATION MOL/L

INITIAL WEIGHT

AVERAGE

FINAL WEIGHT

AVERAGE

DIFFERENCE

0.25

0.63 0.62 0.68

0.64

0.47 0.96 0.6

0.84

0.2

0.50

0.61 0.66 0.39

0.65

0.6 0.62 0.63

0.62

-0.03

0.75

0.6 0.61 0.65

0.62

0.54 0.50 0.51

0.53

-0.09

1

0.65 0.55 0.65

0.62

0.51 0.48 0.55

0.50

-0.12

Water

0.50 0.64 0.47

0.5

0.55 0.56 0.47

0.54

0.04

My prediction was correct and the graph shows how the difference is
decreasing between initial and final lengths and weights.

I think that the method I used was good as it was a fair test and all
results were similar. I got a few odd results, which I think I could
have avoided had I been more accurate. I think the work I have
produced is enough to show the results of osmosis as I have repeated
the test 3 times and they all have similar results.

Investigating the Effect of Different Solutions on Plant Cells 9.9 of 10 on the basis of 1726 Review.