Plants > Seed Plants > Roots
Vascular Seed Plants: Roots
The first thing to remember about roots is that they're different from stems. A root cross section will be round and will contain more or less the same tissue types as a stem, but the arrangement of those tissues is different.
Ranunculus (buttercup) root
This is a dicot with no secondary growth.
The vascular tissue phloem and xylem) is in the center, surrounded by a layer of endodermis. The endodermis contains the casparian strip and helps control the movement of water and nutrients into the vascular tissue.
The xylem consists of large, thick-walled cells that are stained red. The phloem consists of smaller, thin-walled cells that are stained blue. The phloem surrounds the xylem.
Much of the root is filed with cortex, a ground tissue.
The epidermis helps control the movement of water and nutrients into the
Smilax is a monocot with that grows as a woody bush or vine. This root has the same tissues as the Ranunculus root, with a slightly different arrangement of the vascular tissue in the middle.
This page updated September 17, 2011