In summer, cambium
Dies
Is more active
Is not active
Is less active
$A$. 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.
Narrow bands of parenchymatous tissue which passes through the secondary xylem and phloem radially are called
Bulliform cells found in
$A$ : In monocot roots, pericycle gives rise to lateral roots and cork cambium.
$R$ : It has tetrach vascular bundles usually.
The feature which is common to both heartwood and sapwood is