The heartwood cannot conduct water because of

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(D) The heartwood consists of dead elements with highly lignified walls. In the heartwood,the xylem vessels and tracheids are blocked by the depositio

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Deposition of organic compounds

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(D) The heartwood consists of dead elements with highly lignified walls. In the heartwood,the xylem vessels and tracheids are blocked by the deposition of organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils. Additionally,tyloses (balloon-like outgrowths of xylem parenchyma cells into the vessel lumen through pit cavities) further block the xylem elements,preventing the conduction of water.

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