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The Changing Leaves of Autumn
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The Changing Leaves of Autumn

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An interactive powerpoint about how and why leaves change in the autumn.

An interactive powerpoint about how and why leaves change in the autumn.

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  • 1. The Changing Trees of Autumn By Meryl Spierenburg ED 205 (15) Quit Quit About the Author Concept Map Resources
  • 2. Let’s Learn About the Leaves!
    • Where do the colors come from?
    • Why do the leaves change color?
    • How does it work?
    • Why do leaves FALL?
    • What happens after the leaves fall?
    • How do we get the best colors?
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  • 3. Where do the colors come from?
      • Leaves have pigments that give them their color.
      • There are 3 pigments are involved in the autumn color.
      • Chlorophyll
      • Carotenoids
      • Anthocyanins
      • How do they all work together?
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  • 4. Chlorophyll
    • Chlorophyll is the pigment that gives leaves their basic green color.
    • Chlorophyll is necessary for photosynthesis, the chemical reaction that lets plants use sunlight to make food.
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  • 5. Carotenoids
    • Carotenoids are the pigments that produce yellow, orange, and brown colors in the leaves.
    • The are also found in things like corn, carrots, and bananas.
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  • 6. How do they all work together?
    • Chlorophyll and carotenoid are in leaf cells all the time during the growing season. But the chlorophyll covers the carotenoid . That's why summer leaves are green, not yellow.
    • Most anthocyanins are produced only in autumn. Not all trees can make anthocyanins.
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  • 7. Anthocyanins
    • Anthocyanins are the pigments that give leaves their red color.
    • The are also found in cranberries, red apples, blueberries, cherries, and plums.
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  • 8. Why do the leaves change color?
    • Leaves change color mainly because of the longer, cooler nights that occur in Autumn.
    • As the nights get cooler and longer, a biochemical process takes place that causes the leaves to change in color.
    • Click here to watch a video about why leaves change color
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  • 9. How does it work?
    • During the spring and summer, chlorophyll is continually being made, and leaves are green.
    • As the nights get longer in the fall, chlorophyll making slows down and then stops and eventually all the chlorophyll is gone.
    • The carotenoids and anthocyanins that are in the leaf are then able to show their colors.
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  • 10. Why do the leaves fall?
    • In early autumn, the veins that carry fluids into and out of the leaf gradually close off.
    • These closed veins trap sugars in the leaf and start the making of anthocyanins.
    • When this is complete, the leaf is ready to fall
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  • 11. What happens after the leaves fall?
    • On the ground, fallen leaves are broken down by bacteria, fungi, earthworms, and other organisms.
    • The broken-down leaves give the soil nutrients and become part of the layer on the forest floor that absorb and hold rainfall.
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  • 12. When do we get the best color?
    • The autumn colors are the most vibrant when there has been:
      • A warm and wet spring
      • A summer that isn’t too hot or dry
      • A fall full of warm days and cool nights.
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  • 13. About the author
    • This powerpoint was created by Meryl Spierenburg. I am a Junior at Grand Valley State University, majoring in English with a minor in Elementary Education.
    • Please, feel free to e-mail me at: [email_address]
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  • 14. Concept Map Quit
  • 15. Resources
    • http://www.jimpetrozzi.com/site_WW/thumb-wallpaper/Red%20Leaves.jpg
    • http://www.desktoprating.com/wallpapers/nature-wallpapers-pictures/fall-of-autumn-leaves-wallpaper.jpg
    • http://www.jimpetrozzi.com/site_WW/thumb-wallpaper/Red%20Leaves.jpg
    • http://riversaredamp.files.wordpress.com/2007/10/yellow-leaves.jpg
    • http://www.pewclimate.org/docUploads/images/green%20leaves%20with%20rain%20drops.jpg
    • http://www.dnr.state.wi.us/org/caer/ce/eek/veg/trees/treestruecolor.htm
    • http://www.na.fs.fed.us/spfo/pubs/misc/leaves/leaves.htm
    • http://www.esf.edu/pubprog/brochure/leaves/leaves.htm
    • http:// farm1.static.flickr.com/113/315997493_35bc95c19c_o.jpg
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