Question

example in which xylem lacks vessel, while phloem is devoid of companion cells

Answer 1

Gymnosperms lack vessels and companion cells. Instead of companion cells, albuminous cells are present in gymnosperms which are analogous to companion cells.
Expectionally, a few gymnosperms like ephedra, Gnetum and Welwitschia have vessels.

Answer 2

in gymnospermae

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