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Our Fall Leaf experiment


Forum: Homeschooling

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  #1  
October 17th, 2006, 04:43 PM
Sandra314's Avatar Homeschooling Mom
Join Date: May 2005
Location: Texas
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Michael and I are doing a Fall/Autumn unit study this month and we conducted an experiment on the colors of leaves.

Materials we are using:
Coffee filer strips or cut strips of copy paper, popsicle stick or coin, small baby food jar (or paper cup), rubbing alcohol, leaf.

Directions:
Using one-inch coffee filter strips, we positioned a leaf horizontally across the strip about two inches from bottom. Using a popsicle stick or coin, Michael gently rubbed his leaf to transfer some of its pigments onto his strip. Pour rubbing alcohol into a jar so that is is about one inch deep; then he inserts his strip into the jar. We left strip in jar for about 30 minutes; removed and allow to dry.

Background Information on
What we learned about the pigments of a leaf:
We learned the names of leaf pigments.
The green pigment is chlorophyll.
The yellow and orange pigment is carotenoid.
The red pigment is anthocyanin.
The brown pigment is tanin

What we observed:
A green spot and yellow streak formed on the strip. Leaves contain several color pigments. As alcohol moved up the strip, it dissolved and separated the green and yellow pigments.

Our Findings:
When we look at a leaf, we see the green pigment, chlorophyll, because there is more of it. Other color pigments are present too, but they are masked by the chorophyll. In the fall a leaf stops producing chlorophyll and we can see its other pigments.

BELOW IS A PICTURE OF OUR EXPERIMENT:


Here is a link we found useful on why leaves turn color in the Fall season
http://www.na.fs.fed.us/spfo/pubs/mi...ves/leaves.htm
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  #2  
October 17th, 2006, 06:07 PM
KarateMom's Avatar Mega Super Mommy
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Wow, what a neat experiment! Can I copy it and post it up in the Ideas Subforum?
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  #3  
October 18th, 2006, 07:32 AM
Jenneve's Avatar Mega Super Mommy
Join Date: Nov 2005
Posts: 2,933
Wow, what a neat & fun idea! I may have to steal that and use it this week or next. Thanks!
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  #4  
October 19th, 2006, 09:30 PM
MissyPrincessEha's Avatar Platinum Supermommy
Join Date: Feb 2005
Location: Louisiana
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That is GREAT!
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