why do trees change to orange during autumn FROM TOP TO BOTTOM first?

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I’ve seen most of the trees (at least in Canada) change color in autumn to an orangey, I’ve heard it has to do with better absorption of sunlight waves that change during this time of the year.

But why they begin to change from top to bottom? I would think the inner ones or lowest ones would change first since they have less access to sunlight than the top ones.

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7 Answers

Anonymous 0 Comments

The changing of the color is the leaves dying off and losing their chlorophyll to photosynthesize as the tree is going dormant in the branches and moving sap down to the roots. It goes top to bottom because the top is farthest from the roots.

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