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DesLee26
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epidermis characteristics
- 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
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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
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epidermis location
- Found on surface of all primary plant parts’ found on surface of stems and roots
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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
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periderm function
protection of underlying tissues
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periderm location
surface of stema nd non-functional roots (used for anchorage) that are part of secondary plant
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