The functional xylem of dicot tree is

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(a) During the secondary growth, centrally located xylem become nonfunctional due to deposition of tannins etc. the function of conduction of water an

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Sap wood

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(a) During the secondary growth, centrally located xylem become nonfunctional due to deposition of tannins etc. the function of conduction of water and dissolved minerals from roots is now performed by outer younger rings of secondary xylem is called sap wood or alburnum.

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