A) companion cell
B) living cells
C) raw cells
D) lignified cells.
Correct Answer: B
Solution :
: Duramen (heart wood) is the central xylem (secondary xylem) of tree-trunks, frequently impregnated with tannins, resins etc. which can be considered to be excretory products. It contains no living cells. Alburnum (sap wood) is the outer region of the xylem (secondary xylem) in trees. It contains living cells and functional water- conducting and food-storage tissue.
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