Why do leaves change color in the fall?
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plz answer!!!
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Answer:
Trees decide to cut off their leaves in the Fall. The purpose of leaves is to make 'food' for the tree, but they need bright sunlight to do this. When sunlight gets dimmer in the Fall (and not as many hours), trees cut off circulation to the leaves and live on stored food. Chlorophyll is the stuff that makes leaves green, the substance that creates the tree's food out of sunlight and air. When they cut off the circulation, the chlorophyll in the leaves dies and the green color goes away. The colors that are left behind are the colors that were there all along, you just couldn't see them because of the green chlorophyll.
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Other answers
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. The bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples, glucose is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. The brown color of trees like oaks is made from wastes left in the leaves
dune_laurel
because the plants stop making there own food, and they run out of chlorophyll. which is what gives them their green color. some turn red because they have food trapped in them. and others turn brown because they have waste trapped in them.
brent
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