The functional xylem of a dicot tree is:

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(A) During secondary growth,the centrally located xylem becomes non-functional due to the deposition of organic compounds like tannins,resins,and oils

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Sap wood

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(A) During secondary growth,the centrally located xylem becomes non-functional due to the deposition of organic compounds like tannins,resins,and oils. This central,non-functional region is known as heartwood or duramen. The outer,younger rings of secondary xylem,which remain functional and are responsible for the conduction of water and dissolved minerals from the roots to the leaves,are called sapwood or alburnum.

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