Bulliform cells are the modification of
Abaxial epidermis cell
Adaxial epidermis cell
Mesophyll
Vascular tissue
Cork cells are
The organisation of the shoot apex into tunica and corpus is determined largely on the basis of
$A$ : In monocot roots, pericycle gives rise to lateral roots and cork cambium.
$R$ : It has tetrach vascular bundles usually.
In dicot stem, vascular bundles are
interfascicular cambium develops from the cells of :