Commercial cork is obtained from .........

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(A) Commercial cork is obtained from the bark of the tree $Quercus$ $suber$, which is commonly known as the cork oak. The cork is produced by the phel

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Quercus suber

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(A) Commercial cork is obtained from the bark of the tree $Quercus$ $suber$, which is commonly known as the cork oak. The cork is produced by the phellogen (cork cambium), which forms a thick layer of suberized cells on the outer side. This tissue is harvested periodically without killing the tree, making it a sustainable source of natural cork.

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$A$: Complementary cells are cut-off by phellogen towards the outside.
$R$: Phellogen is partially secondary in origin.

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