(B) The peripheral region of the secondary xylem is lighter in color and is known as the sap wood or $Alburnum$.It is physiologically active and is in

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(B) The peripheral region of the secondary xylem is lighter in color and is known as the sap wood or $Alburnum$.It is physiologically active and is involved in the conduction of water and minerals from the root to the leaf.In contrast,the central,darker,and harder region is called heartwood or $Duramen$.