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CASE ANALYSIS SHEET
1.
Recognize potential issues and major topics in the case What is this case about?
Underline and list terms or phrases that seem to be important.
Then, list 3-4 biology-related topics or issues in the case.
Removing fern stains Pigments solvent (rubbing alcohol)
Little challenges
differences between ferns and grass
Care and concern (both mother and son) How to avoid stains
A mother’s work is never done Gender issues (mother cleans,
sister’s soccer) Development of life skills
2. What specific questions do you have about these topics? By yourself, or better yet in a group, list what
you already know about this case in the “What Do I Know?” column. List questions you would like to learn
more about in the “What Do I Need to Know?” column.
What Do I Know?
What Do I Need to Know?
 Alcohol will remove the pigments
 What are the different green plants
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because it is a solvent
The pigment is chlorophyll
There are many commercial stain
removers on the market
Ferns have spores
Crushing the leaves breaks the
cells and releases pigment
The different types of solvents
remove different stains or to
different extent
Grass stains can be removed by
alcohol
Ferns are non-flowering plants,
grasses are flowering plants
Energy conversions of the boy
chasing the ball that got away and
slid into ferns
Alcohol is an organic solvent
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she has in her garden?
How effective is alcohol in
removing the stain?
What other stains can alcohol
remove?
How can we acquire those stains?
What is the difference between
fern and grass w.r.t. pigments?
Is the material of the shorts and
pants the same?
Are their differences if wash in cold
versus warm temperatures?
Does alcohol also remove the
colored pigments from the shorts
or pants?
Can alcohol be used to remove all
types of stains?
Is there a difference between
rubbing alcohol and ethanol?
How is this case linked to
developing 21st century skills?
How does the concentration of the
alcohol affect the stain removal?
3. Put a check mark by 1-3 questions or issues in the “What do I need to know?” list that you think are
most important to explore.
Waterman, M. A. and Stanley, E. D. 2004. ICBL Case Analysis Worksheet. NIE Workshops 2011
4. What kinds of references or resources will help you answer or explore these questions? Identify two
different resources and explain what information each resource is likely to give that will help you answer the
question(s). Choose specific resources or types of resources.
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Look at ingredients in commercial stain removers, then see what the
solvents are.
Google “what can alcohol remove?”
Guides to flowering plants and ferns, science center books from
Singapore Science Center
Simple experiments to see for themselves: e.g., use alcohol and try on
various stains
Supermarket to look at different alcohols (medicinal!!!!!)
Check in with parents, family for folk lore on stain removal
By identifying the fern, then google to see if there are other pigments
besides chlorophyll in that fern
Check on TV programs with crazy experiments, students find experiments
online, etc.
Check on national parks website NPB.sg
Check with the gardener, is there a “secret formula” for cleaning stains
Use enzyme detergent
Read the clothing labels!!!
Waterman, M. A. and Stanley, E. D. 2004. ICBL Case Analysis Worksheet. NIE Workshops 2011