Question

Why is cork impervious to gases and water?

Answer 1

Plasma membrane is semi permeable and it is not impervious towater. Lignin is a complex polymer which acts as a cement and hardens the cell wall. ... The walls of cork cells are heavily thickened with an organic substance, suberin, Suberin makes these cells impervious to water andgases.

Answer 2

Answer:

Cork cells are formed as a part of the bark. The waterproof waxy layer present on the cork cell is the suberin., Quercus suber. Its main function is as a barrier to the movement of water and solutes. Suberin is highly hydrophobic and a somewhat 'rubbery' material. In roots, suberin is deposited in the radial and transverse cell walls of the endodermal cells.

This structure, known as the Casparian strip or Casparian band, functions to prevent water and nutrients taken up by the root from entering the stele through the apoplast. Pectin, lignin, and cellulose are not hydrophobic materials.

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