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As plants grow older, the outer protective tissue of the stem changes into cork.how does this happen? list any two salient features of cork.

As plants grow older, the outer protective tissue of the stem changes into cork.how does this happen? list any two salient features of cork.

Grade:10

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
7 years ago
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.

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