Which of the following meristems is responsible for extrastelar secondary growth in dicotyledonous stem
Phellogen
Intrafascicular cambium
Interfascicular cambium
Intercalary meristem
Tissue present in an annual ring is
In the given diagram of lenticel, label $A, B, C$ in the given option
$A$ : In monocot roots, pericycle gives rise to lateral roots and cork cambium.
$R$ : It has tetrach vascular bundles usually.
The heartwood cannot conduct water because of
During secondary growth of plants, stem phellogen cuts of cells on both sides. The outer cells gets differentiated into ...$A$... and the inner cells gets differentiated into ...$B$... cortex
Choose the correct combination of $A$ and $B$ with reference to above statement