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Please help

Ross Koning koning at ECSUC.CTSTATEU.EDU
Mon Nov 3 09:17:28 EST 1997


At 2:43 PM -0500 11/2/97, Carl Clark wrote:
>Son has home work beyond me. "Do all seeds plants bear fruit?" thats the
>question  can you help?

No is the answer you seek.  While all flowering
plants produce fruit that contain seeds, there
are seed plants that bear no fruit.  Good examples
include the gymnosperms (literally: naked seeds)...
their seeds are produced on a modified leaf (cone
scale) attached to the surface, so there is NO
fruit surrounding the seed.  Examples include
the conifers (pine, spruce, etc.)  Of course in
a few cases the seeds may LOOK surrounded by a
fruit (the "berries" of yew =3D Taxus cuspidata),
but in most of these, the fleshy covering is an
aril (modified seed coat) NOT fruit (modified
ovary wall).  The extinct seed ferns also had
seeds but produced no fruit.

ross

_______________________________________________________________
Ross Koning                 | koning at ecsu.ctstateu.edu
Biology Department          | http://koning.ecsu.ctstateu.edu/
Eastern CT State University | phone: 860-465-5327
Willimantic, CT 06226 USA   | fax: 860-465-4479
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