Heartwood or duramen is:

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(B) Heartwood,also known as duramen,is the inner,darker,and harder region of the secondary xylem in older trees.It consists of dead elements with high

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Inner region of secondary xylem

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(B) Heartwood,also known as duramen,is the inner,darker,and harder region of the secondary xylem in older trees.It consists of dead elements with highly lignified walls.It is filled with organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils,which make it resistant to microbial attacks and insects.It does not conduct water but provides mechanical support to the stem.

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