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Autumn Leaves and Ripening Bananas Riddle on the Sept 20 DCT
As you are clicking madly on the flying leaves of Fall Fest on WW, or perhaps as you are driving through the countryside admiring the scenery, do you ask yourself: Why do the leaves turn all sorts of colors? Each color has a separate explanation.
YELLOW: What do autumn leaves and ripening bananas have in common? The green color in unripe bananas comes from chlorophyll, the same pigment that gives green leaves their color. As bananas ripen, the chlorophyll breaks down and disappears, revealing the yellow color which has been there all along. The yellows and oranges of autumn leaves are also revealed as their chlorophyll breaks down. Those yellows and oranges were there all along, all summer long. The yellow color comes from xanthophylls, and the orange color from carotene. Yes, like in carrots!
RED: Bright red and purple leaf colors come from anthocyanins. These are antioxidants (good for you, remember?) found also in beets, apples and grapes.The leaves manufacture these anthocyanins in the fall, from trapped glucose.
Glucose is sugar. The leaves are red because they are full of sugar!
BROWN:
Some leaves turn brown because of tannin, a bitter waste product.
Here's a fun experiment that you can do easily:
1-Find a tree whose leaves will turn bright red or purple (maple, flowering dogwood, sweet gum, etc).
2-Choose several leaves that are getting bright sunlight, and cover up half of the leaf with aluminum foil or heavy paper and tape.
3-After the leaves have changed color, remove the covering that you applied, and observe the colors underneath. Those are the colors that were in the leaf all summer.
The bright red and purple are only made in the fall, with exposure to light.
Re: Autumn Leaves and Ripening Bananas Riddle on the Sept 20 DCT
I stared at Webberlily's profile and refreshed every 5 seconds, waiting for it to change from "Create Thread Open Mike" To "... On the September 20 DCT"
xD
Re: Autumn Leaves and Ripening Bananas Riddle on the Sept 20 DCT
Originally Posted by Twee Fluffy
I stared at Webberlily's profile and refreshed every 5 seconds, waiting for it to change from "Create Thread Open Mike" To "... On the September 20 DCT"
xD
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Autumn Leaves and Ripening Bananas Riddle on the Sept 20 DCT 
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