Question

Composition of periderm.

Answer 1

Structure of Periderm: The periderm consists of the phellogen or cork cambium, the meristem that produces the periderm; the cork or phellem, the protective tissue produced outside by the phellogen, and the inner cortex or phelloderm, the living parenchyma, formed inside by the phellogen.

Answer 2

The Periderm Is Composed Of Phellem, Phellogen, And Phelloderm.

Periderm-

• The periderm is a protective structure of secondary origin that replaces the damaged epidermal cell layer.
• During secondary growth(increase in girth) The gymnosperms and dicots, the periderm helps in gaseous exchange
• The periderm is composed of their tissues- phellogen(cork cambium), phellem(cork), and phelloderm(cork parenchyma).
• The phellem or cork cells are dead cells and their cell walls are highly suberized which makes them effective barriers.
• Periderm in stems is formed under the epidermis.
• While in roots the periderm is derived from the pericycle cell layer
• Phellogen gives rise to phelloderm. Phelloderm may contain chlorophyll and has a defensive function.
• The cells of phelloderm are thinly walled and not suberized.

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