Consists of usually one layer of cells; prevalent cell is epidermal cell proper (tabular in shape); often associated with crescent-shaped cells, called guard cells (pairs)à make up stomal apparatus (allows for exchange of gases)
Epidermal cell: often associated to be parenchymal cell despite tabular shape; most lack chlorophyll; in the area of the leaf and the stem, the epidermal cells secrete a waxy cuticle on top of tissue; not present in the roots; in the roots, its called root hairs
epidermis function
Guard cells allow for exchange of gases
Epidermal protect and prevent dehydration of the moisture of the plant through the waxy cuticle
Root hairs increase SA for the absorption of water and minerals
epidermis location
Found on surface of all primary plant parts’ found on surface of stems and roots
periderm characteristics
complex tissue composed of cork and cork cambium
cork: cells dead at maturity filled with lipid substance called suberin
cork cambium: meristematic tissue that gives rise to new cork cells as cork sloughs off
periderm function
protection of underlying tissues
periderm location
surface of stema nd non-functional roots (used for anchorage) that are part of secondary plant