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by Anonymous on November 22nd, 2009

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Many trees have leaves that are green in the summer and red, yellow or orange in autumn. Where were these colors during summer ? How can they suddenly appear in autumn?

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  • by Sharona Life is a Tale Told by an Idiot on November 22nd, 2009

    Sharona Life is a Tale Told by an Idiot

    As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter.

    During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off the food they stored during the summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small amounts of these colors have been in the leaves all along. We just can't see them in the summer, because they are covered up by the green chlorophyll

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