A) By degeneration of protoplast of living cells
B) Tyiosis formation
C) By deposition of resins, oil, gums etc.
D) All of these
Correct Answer: D
Solution :
By the deposition of resins, oils, gums etc. in the xylem cell wall. formation of tyiosis in xylem vessels and by degeneration of protoplast of living cell sap wood is converted into heart wood.
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