Question

What changes take place in epidermis as the plant gets older?

Answer 1

As plant get older then its epidermis layer starts to break.

Answer 2

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In gymnosperms and dicotyledons,secondary growth occurs in the stem and root.The secondary protective tissue -the periderm replaces the epidermis.Unlike epidermis,periderm is an multilayered tissue system and consist of Phellogen(cork cmbium) or lateral meristem which produces-

1.Phellem(cork) towards outside and

2.Phelloderm(secondary cortex) towards inside.

The bulk of periderm constitutes cork.The cells of cork are dead at maturity with thick walls impregnated with a waxy material called suberin.Commercial cork is harvested from oak tree(Quercus suber).

Two features of cork-

1.Cork is highly compressible and does not catches fire easily.

2.Cork insulates trees from freezing temperatures in the cold winter and also helps in conservation of water.