What is an epidermis?


epidermis outermost cellular layer covers whole plant structure, i.e. covers roots, stem, leaves, flowers , fruit. composed of single layer of living cells, although there exceptions. epidermis closely packed, without intercellular spaces or chloroplasts. outer walls, exposed atmosphere , thickened, , may covered waxy, waterproof cuticle made of cutin. apart normal epidermal cells there stomata in epidermis of leaves , stem. stoma opening (pore) bounded 2 beanshaped cells called guard cells . guard cells differ normal epidermal cells in have chloroplasts , cell walls thickening unevenly; outer wall thin , inner wall (nearest opening) thick. thin-walled epidermal cells of roots give rise root hairs. hair- outgrowths may found in epidermis of leaves , stems.



Science & Mathematics Botany Next



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