How do seed cells know the difference between top and bottom?

Tom Roger Kise tomk at
Mon Apr 21 04:25:14 EST 1997

Matthew wrote:
> If you plant a germinating seed in soil, how does the seed know where
> is the top and where is the bottom?

What I believe is that the root avoids light, and the top seeks light.
Isn't it so?

Tom Kise (tomk at
Casparisgt. 11 (
0174 OSLO (22 11 23 65)

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