Interpetiolar stipules occur in

The pattern of arrangement of leaves on the $......$ is known as phyllotaxy.

Leaves of dicotyledonous plants possess . . . . . . venation,while . . . . . . venation is the characteristic of most monocotyledons.

The leaf of $Bombax$ is:

$A$: Reticulate venation is observed in the leaves of sunflower.
$R$: Sunflower is included in the class Dicotyledonae.

Structure of leaf which provides channels of transport for water,minerals,and food materials is called: