Gymnosperm plants lack All the above. They are characterized by having "naked seeds," meaning they lack fruits (ovaries). Their xylem typically lacks vessels (using tracheids instead), and their phloem lacks companion cells (using albuminous cells instead).

Vessels: Absent in most gymnosperms (present only in Gnetales).

Fruits: Absent because they are non-flowering and naked-seeded.

Companion Cells: Absent in phloem.

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