do plants really follow the sun

mystic mystic at
Sat Jan 22 05:47:04 EST 2000

patrickhall at wrote:
> What part of a plant detects light so it can follow the sun?

Plants follow the sun because of increased elongation of the stem on the
shadowed side.  The growth of cells on the sunny side of the stem is
suppressed by the presence of light (the growth hormone that causes
cells to lengthen is photo-sensitive), so that one side of the stem is
slightly longer than the other.  This makes the stem bend toward the sun
during the day.  


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