The length of different internodes in a culm of sugarcane is variable because of
Shoot apical meristem
Position of axillary buds
Size of leaf lamina at the node below each internode
Intercalary meristem
The length of a plant axis increases by
The balloonshaped structures called tyloses
Cork is a derivative of
State maize epidermis period.
$A$ : Endodermis is present between general cortex and pericycle in maize stem.
$R$ : Eustele is present in maize stem.