Heartwood differs from sapwood in

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(C) Heartwood,also known as $duramen$,is the central,darker,and harder part of the secondary xylem.It consists of dead elements with highly lignified

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having dead and non-conducting elements

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(C) Heartwood,also known as $duramen$,is the central,darker,and harder part of the secondary xylem.It consists of dead elements with highly lignified walls,which makes it non-conducting.In contrast,sapwood,or $alburnum$,is the peripheral,lighter-colored part of the secondary xylem that is involved in the conduction of water and minerals.Heartwood is resistant to microbial and insect attacks due to the deposition of organic compounds like tannins,resins,oils,gums,and aromatic substances in the vessels,which block them (tyloses).Therefore,the primary difference is that heartwood consists of dead and non-conducting elements.

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