Angiosperms VS. Gymnosperms (physiological differences)

sequoia_stiffy(9)December 20, 2007

what are some of them, in terms of leaf structure, vascular tissues, etc? Looking at some of the agathis and podocarpus species, they look so much more like angiosperms, like flowering trees, than gymnosperms. So, I wonder, what are some other differences between angiosperms and gymnosperms besides the obvious seed structure? How about leaf structure, vascular differences, etc. Anybody know?

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pineresin

Gymnosperms (apart from Gnetophytes) don't have vessels in their xylem (wood); Angiosperms do. There are other differences, but it's a bit early in the morning for me to remember them all yet ;-)

Otherwise, it is fairly tricky, as convergent evolution has resulted in many characters developing similar appearance as an optimum for various purposes, even though in structural development and origin they differ (e.g. alder 'cones', yew 'berries', broad-leaved Agathis leaves, needle-like Erica leaves, etc., etc.).

Resin

    Bookmark   December 20, 2007 at 4:37AM
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Fledgeling_(4b SD)

The transporting tissue of Angiosperms are vessel elements. The Gymnosperms have a different structure, tracheids, that preform the same function. http://en.wikipedia.org/wiki/Tracheid

The presence of resin canals, on the conifers that usually have them (Dont remember which do and which dont), are a dead giveaway.

    Bookmark   December 20, 2007 at 10:36AM
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