biology 23.2
TRANSCRIPT
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23.2 ROOTS
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TAPROOT
The primary root found in some plants that
grows longer and thicker than other roots
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FIBROUS ROOT
Part of a root system in which roots branch to
such an extent that no single root grows
larger than the rest
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ROOT HAIR
Tiny project from the outer surface, or
epidermis, of a root
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CORTEX
Spongy layer of ground tissue just inside the
epidermis of a root
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ENDODERMIS
A layer of cells that completely encloses
vascular tissue
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VASCULAR CYLINDER
central region of a root that includes the
vascular tissue—xylem and phloem
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ROOT CAP
Structure that protects a root as it forces its
way through the soil
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CASPARIAN STRIP
Waterproof strip that surrounds plant
endodermis cells
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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.
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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.
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KEY CONCEPT
Roots anchor a plant in the ground
and absorb water and dissolved
nutrients from the soil.