External protective tissues of plants are (of dicot stem are)
A
Cork and pericycle
B
Cortex and epidermis
C
Pericycle and cortex
D
Epidermis and cork
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$A$. 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.