In the following how the sap wood is converted into heart wood

Options

A. By degeneration of protoplast of living cells
B. Tyloses formation
C. By deposition of resins, oil, gums
D. All of the above

Answer

D

Explanation

Sap wood is converted to heart wood by filled with resins, gammy or tannins like substances produced by adjacent living parenchymatous cells.
(2) Due to deposition of tyloses that are bladder like in growth of parenchymatous cell.