result of exp2
TRANSCRIPT
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School-based assessment
Practical related tasks
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Osmosis in Living Tissue
To determine the water potential of potatotissue.
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Curriculum Link
C1 Water for Living
Movement of water in and out of cells by osmosis
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Background
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How can we determine the water potential of
potato tissues?
Potato
1.0 M Sucrose solution
(= 342 g sucrose in 1 L of solution)
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Apparatus and Chemicals
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Procedure (1)
A series of sucrose solution of
different concentration.
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Procedure (2)
Cut potato cylinders into length of 5 cm.
Blot dry the potato cylinders and put them into a Petri dish.
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Procedure (3)
Immerse 2 potato cylinders in
each tube that contains different
concentration of sucrose
solution.
After 40 mins, take out the
potato cylinders, blot dry and
measure the length of the potato
cylinders.
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Result Table
1. Tabulated result :
Notice the position of independent variable,dependent variable in the table.
Units and suitable conversions should be shown
clearly and correctly
Title of the table should be written correctly according
to the aim of the experiment.e.g. Effect of sucrose concentration on thee.g. Effect of sucrose concentration on the
length of potato cylinderlength of potato cylinder.
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Effect of sucrose concentration on the percentage
change in length of potato cylinder
- 3.04.854.84.950.6
- 1.04.954.95.050.4
- 5.04.754.74.850.8
4.6
5.1
5.2
- 7.04.654.751.0
+ 3.05.155.250.2
+ 5.05.255.350
% change in% change in
length of potatolength of potatocylinderscylinders
AverageAverage
ffinal lengthinal length
of potatoof potatocylinderscylinders
(cm)(cm)
FFinal lengthinal length
of potatoof potato
cylinderscylinders
(cm)(cm)
OOriginalriginal
length oflength of
potatopotatocylinderscylinders
(cm)(cm)
concentrationconcentration
of sucroseof sucrosesolutionnsolutionn/ M)/ M)
Key : + increase in lengthKey : + increase in length
-- decrease in lengthdecrease in length
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Graph
Notice the choice of axes
x-axisfor independent variable (unit should be stated)
y-axisfor dependent variable (unit should be stated)
Notice the rule of using short straight lines to join
the points or the smooth curve to join the points Title of graph should be added correctly and related
to the aim of the experiment
e.g. Effect of sucrose solution on the % change in length of potato
cylinders
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Effect on sucrose concentration on the %Effect on sucrose concentration on the %Effect on sucrose concentration on the %Effect on sucrose concentration on the %
change in length of potato cylinderchange in length of potato cylinderchange in length of potato cylinderchange in length of potato cylinder
-8.0-8.0-8.0-8.0
-6.0-6.0-6.0-6.0
-4.0-4.0-4.0-4.0
-2.0-2.0-2.0-2.0
0 .00.00.00.0
2 .02.02.02.0
4 .04.04.04.0
6 .06.06.06.0
0000 0.20.20.20.2 0.40.40.40.4 0.60 .60.60 .6 0.80.80.80.8 1111 1.21.21.21.2
Concentration of sucrose solution / MConcentration of sucrose solution / MConcentration of sucrose solution / MConcentration of sucrose solution / M
%c
hangeinleng
thofpotato
%c
hangeinleng
thofpotato
%c
hangeinleng
thofpotato
%c
hangeinleng
thofpotato
cylinders
cylinders
cylinders
cylinders
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Laboratory Report Title
Aims
Theory/Background (optional)
Apparatus
Design of experiment
Procedure
Precautions and safety measures
Results (including data and observations)
Discussions (including possible sources of errors andimprovements to be made)
Conclusion
Questions for further thought (optional)
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Assessment CriteriaArea A (Max:10)
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Assessment criteriaArea B (Max:10)
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Assessment CriteriaArea B (Contd)