Title: I’m so thirsty!
Idea for the case or the case draft
Gerald was all alone at home one fine day as his parents had gone overseas for a work trip.
He was feeling very hungry yet too tired to cook anything for dinner. He decided to order
his favourite Domino’s pizza.
“Good evening! I would like to have a large pepperoni pizza
with extra cheese topping.” Gerald informed the call
receptionist on his order.
When the pizza arrived, he excitedly gobbled up the pizza while
watching his favourite soccer match on television.
However, a couple hours after eating the pizza, Gerald noticed he was especially thirsty.
“Oh my god! I’m so thirsty! It’s already my fourth glass of water!” exclaimed Gerald. Just
before Gerald moves on to his fifth glass, his sister came home after work and stopped him
immediately.
“Stop at once!” said Gerald’s sister. Shaking her head, she continued, “I would not advise it.”
Resources: Include the main simulation or tool used and one additional resource
http://www.kscience.co.uk/animations/turgor.htm
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/cells/cells4.shtml
Two possible investigations that use inquiry: Include details of what students will do, any
lab sheets you have found, etc.
Investigation 1: Investigating the effects of different water concentrations on the potato
strip
1. Measure and cut the length of each potato strip into 4cm.
2. Label and fill the petri dishes with each of the different salt solutions.
3. Place one potato strip into each of the solutions and leave it immersed in the solution
for 20 minutes. Ensure that the solution covers the entire potato strips. Cover the petri
dishes.
4. After 20 minutes, remove the potato strips from the solutions. Make sure you know
which strip is from which solution. Do not mix the strips up.
5. Dry each strip with the kitchen towel, measure and record the length of each strip of
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potato accurately in the table below.
Source: LSS Exp/N(A) Teaching and Learning Guide, CPDD, 2008
Investigation 2: Observing plasmolysis in plant cells
Source: http://www.nuffieldfoundation.org/practical-biology/observing-osmosisplasmolysis-and-turgor-plant-cells
Two possible student products
Design a mini-poster to report on inquiry’s findings
Design a pamphlet to educate the public on reducing salt intake
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One example rubric for one of your products
Poor
1
Fair
2
Good
3
Excellent
4
Data table
and/or graph
missing
information
and are
inaccurate.
Data table
and graph
both present
with 2 or
more minor
inaccuracies.
Data table and
graph both
present and
accurate with
one mistake.
Data table
and graph
neatly
completed
and totally
accurate.
Discussion &
Conclusions
Presents an
illogical
explanation
for findings does not
address
hypothesis.
Presents an
illogical
explanation
for findings barely
supports
hypothesis.
Presents a logical
explanation for
findings -mostly
support the
hypothesis.
Presents a
logical
explanation
for findings
which
support the
hypothesis.
Organization
Very
Scattered
Scattered
Better Structured
Well
Structured
Effort
Little Effort
Decent Effort
Good Effort
Outstanding
Effort
Presentation
Quality
Hard to hear
Some voice
clarity
Good voice
clarity
Excellent
voice clarity
Overall
Below
Average
Average
Good
Excellent
Topic
Results
Score
How the 21st Century Competencies are addressed
1. Civic Literacy, Global Awareness & Purposefully divide the students into groups with
mixed gender and race
Cross-cultural Skills
2. Critical and Inventive Thinking
Educate the community about healthy eating habit
(low salt intake)
Conclusion of results in mini-poster
Decipher what happens to an animal cell when placed
in water of high and low water potential (relate to
water drunkenness)
How to manage the findings (recording and analysis)
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3. Information and Communication
Skills
Collaborate within their groups to design a miniposter or pamphlet
Themes/major concepts of Lower Secondary Science Syllabus 2013 addressed
Theme
Major idea
Systems
Osmosis facilitates the movement of water molecules.
Authors and school affiliations
Angela Chua Li Xia – Jurongville Secondary School
Koh Huey Min – Marsiling Secondary School
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