Sunday, December 19, 2010

Leaves Maintain a Constant Temperature

Research shows that leaves on trees in the tropics to the Arctic maintain a fairly constant temperature of 70°F.

Scientists assumed leaf temperature was the same as its environment because trees are not warm-blooded. The shocking find reveals that leaves from the tropics evolved mechanisms for keeping cool (e.g. angling themselves away from the sun) while trees in polar regions have ways to heat their leaves (e.g. having more leaves per branch to bundle up).

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