Between which of the contiguous cells is the middle lamella absent?

The vestigial stomata are present in

The correct situation of mesophyll in an isobilateral grass leaf is shown by:

Large,empty,colourless cells of the adaxial epidermis along the veins of grass leaves are:

In a leaf,the position of protoxylem is:

The vertical section of a dorsoventral leaf through the lamina shows three main parts namely,epidermis,$A$,and vascular system. The epidermis,which covers the upper surface is $B$ and the lower surface is covered by $C$ of the leaf. Choose the correct combination of $A$,$B$,and $C$.