Epidermis (botany)
The epidermis (from the Greek "επίδερμίδα", meaning "over-skin") is a single-layered group of cells that covers plants' leaves, flowers, roots and stems. It forms a boundary between the plant and the external environment. The epidermis serves several functions, it protects against water loss, regulates gas exchange, secretes metabolic compounds, and (especially in roots) absorbs water and mineral nutrients. The epidermis of most leaves shows dorsoventral anatomy: the upper (adaxial) and lower (abaxial) surfaces have somewhat different construction and may serve different functions. Woody stems and some other stem structures produce a secondary covering called the periderm that replaces the epidermis as the protective covering.
Read more about Epidermis (botany): Description, Guard Cells, Cell Differentiation in The Epidermis
Famous quotes containing the word epidermis:
“Allusion has been made to [Proust’s] contempt for the literature that “describes,” for the realists and naturalists worshipping the offal of experience, prostrate before the epidermis and the swift epilepsy, and content to transcribe the surface, the façade, behind which the Idea is prisoner.”
—Samuel Beckett (1906–1989)