$A$. Heart wood is durable, dark and central in position.
$B$. Tyloses are balloon like structures of xylem parenchyma in vessel lumen.
$C$. Late wood is formed during spring season.

  • A

    All are correct

  • B

    Only $A$ is correct

  • C

    Only $B$ is incorrect

  • D

    Only $C$ is incorrect

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