Why do leaves change colours?

Manila, Philippines
September 9, 2015 6:35am CST
In autumn, in temperate regions, the days are warm and the nights are cool. It is then that many plants lose their green colour and take on brilliant hues of yellow, orange, red, and purple. During most of its life, a green leaf produces food. Then, for reasons scientists do not completely understand, food productions slowly stop. The substance responsible for the green color breaks down. Then new colouring substance appear. These substances produce the bright autumn colours.
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1 response
@loki1982 (782)
• Dallas, Texas
9 Sep 15
A leaf is naturally a brown, red or tan color. During the spring most leaves fill with chlorophyll which is green in color and coverts sun's rays into energy. During the fall, the sun does not produce as much energy for the earth and the leaves are not longer needed to absorb the energy. In fact keeping the leaves alive would cause the tree to use more energy. So the leaves die and drop off until the next spring when the strong energy from the sun returns.
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@Raelove (16820)
• Saco, Maine
9 Sep 15
You're right, Jared. That's exactly what happens.
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