Date: Tue, 26 Mar 2002 12:18:16 -0500

Author: Ed Sabol

Subject: Re: trees


Geotropism. I did the seedlings on a turntable in our greenhouse it did work
----- Original Message -----
From: "Anthony Lapinski"
Sent: Tuesday, March 26, 2002 11:51 AM
Subject: trees

> I just came back from a ski trip at Lake Tahoe. So many trees!
> I noticed that the mountain trees always grew straight upward no matter
> what the slope of the mountain. Is this because they must fight gravity
> which is straight downward?
> I also read somewhere that if you plant a seed (in soil!) on the edge of a
> rotating turntable, it will grow and lean toward the center of the circle
> because it must fight its own inertia (the "centrifugal" force -- a
> fictitious force) -- the tendency for it to fly off on a tangent.
> Are these two situations similar?
> Anthony Lapinski
> Princeton Day School