Leaves need chlorophyll to stay green and chlorophyll needs sunshine for production. As the days get shorter in the fall, the leaves produce less chlorophyll. When the chlorophyll level declines, the carotenoids show up better. Carotenoids are the yellow, orange, and red pigments that make autumn leaves.
2006-09-20 09:03:15
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answer #1
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answered by Ms. Roberts 3
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Shorter days. There is not enough light to keep the chlorophyll going so the dying off process starts the "fall" season of the leaves.
2006-09-23 20:14:47
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answer #2
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answered by busybody12 5
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Some creep goes around, painting all the trees and bushes, red, orange, and yellow, none of this green bogus anymore, WINTER IS COMING BOII
2016-10-05 03:54:26
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answer #3
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answered by Savannah 1
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because they die before winter, it is a natural process
2006-09-21 01:28:53
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answer #4
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answered by bprice215 5
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because they get embarrassed when they know they are about to fall off the tree.
2006-09-20 09:07:04
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answer #5
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answered by mxzptlk 5
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the green pigment cholorphyll dies and the other pigments of the leaf are shown.
2006-09-20 08:45:06
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answer #6
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answered by pecora2404 2
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the trees go dormant
2006-09-20 08:48:14
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answer #7
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answered by twopipes1 3
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because they are dieing
2006-09-21 06:04:12
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answer #8
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answered by traveller 7
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because they die and lose their chlorophylle
2006-09-20 08:45:22
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answer #9
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answered by HD1 2
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