The cork is impervious to water due to

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(C) The cork,also known as $phellem$,is a protective tissue formed during secondary growth. Its cells are dead and have walls that are heavily thicken

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Suberin deposition in the cell wall

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(C) The cork,also known as $phellem$,is a protective tissue formed during secondary growth. Its cells are dead and have walls that are heavily thickened with $suberin$,a fatty substance. $Suberin$ is hydrophobic in nature,which makes the cork cells impervious to water and gases,thereby preventing water loss from the plant body.

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