How do they do that???

jim mcnamara j_mcnamara at
Fri Oct 18 14:14:48 EST 1996

This is a short, not perfect, explanation---
In essence: the part of the stem away from light elongates faster
then the part of the stem in light, making it grow "bent".

This process is influenced by plant hormones which control
cell elongation, and light receptors which turn on/off the 
effects.  Some sources think that light actually destroys or
prevents the formation of these hormones.

jim mcnamara
Eric Blanchette wrote:
> Could some one please tell me why and how plants bend toward light
> sources!!!
> Thanks A Lot!!!

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