In gymnosperm xylem, only tracheids are found, while in angiosperm xylem, both tracheids and vessel elements are used to transport water. However, vessel elements are much more efficient water transporters than are tracheids. Since vessel elements are so much better at water transportation than tracheids, why is it hypothesized that natural selection has not eliminated tracheids from angiosperms?

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    Tracheids are much less susceptible to forming air bubbles that impede the flow of water through the xylem.
    Tracheids can be used to transport photosynthetic products when the phloem of a plant is destroyed.
    Tracheids also function in the photosynthesis of the plant.
    Tracheids are also used in the fertilization of the female gametes by pollen.
asked May 19, 2013 in Biology by anonymous
    

1 Answer

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Tracheids are much less susceptible to forming air bubbles that impede the flow of water through the xylem.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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