Date post: | 04-Jul-2015 |
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23.2 ROOTS
TAPROOT
The primary root found in some plants that
grows longer and thicker than other roots
FIBROUS ROOT
Part of a root system in which roots branch to
such an extent that no single root grows
larger than the rest
ROOT HAIR
Tiny project from the outer surface, or
epidermis, of a root
CORTEX
Spongy layer of ground tissue just inside the
epidermis of a root
ENDODERMIS
A layer of cells that completely encloses
vascular tissue
VASCULAR CYLINDER
central region of a root that includes the
vascular tissue—xylem and phloem
ROOT CAP
Structure that protects a root as it forces its
way through the soil
CASPARIAN STRIP
Waterproof strip that surrounds plant
endodermis cells
KEY CONCEPT
The two main types of roots are
taproots, which are found mainly in
dicots, and fibrous roots, which are
found mainly in monocots.
KEY CONCEPT
A mature root has an outside layer,
the epidermis, and a central
cylinder of vascular tissue. Between
these two tissues lies a large area
of ground tissue.
KEY CONCEPT
Roots anchor a plant in the ground
and absorb water and dissolved
nutrients from the soil.