The possibility of being the outermost layer of a plant cell is highest for which of the following?

The cell wall of a root hair is . . . . . . .

.......... connect the cytoplasm of neighbouring cells.

Each of the following terms has some anatomical significance. What do these terms mean? Explain with the help of line diagrams.
$(A)$ Plasmodesmata
$(B)$ Middle lamella
$(C)$ Secondary wall

Which of the following is correct for the middle lamella of a eukaryotic cell?

Plasmodesmata are