Biology / Bio 2509 · Atom · ~20 seconds

Simple versus Complex Tissue: Xylem and Phloem

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A simple tissue, such as dermal tissue, is made of one cell type; a complex tissue, such as vascular tissue, combines several.

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Xylem combines vessel elements, tracheids, and parenchyma; phloem combines sieve-tube cells, companion cells, and parenchyma and fibers.

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Xylem conducting cells are dead at maturity; phloem conducting cells stay alive — a distinction worth keeping straight.