Biology / Unit 11 Bio 2509 short lesson, about 20 seconds
Simple versus Complex Tissue: Xylem and Phloem
Captions available
The idea
A simple tissue, such as dermal tissue, is made of one cell type; a complex tissue, such as vascular tissue, combines several.
In practice
Xylem combines vessel elements, tracheids, and parenchyma; phloem combines sieve-tube cells, companion cells, and parenchyma and fibers.
Where people slip
Xylem conducting cells are dead at maturity; phloem conducting cells stay alive — a distinction worth keeping straight.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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