Which of the following structures is an effective transport pathway between two adjacent cells?

Which substance is present in the middle lamella of a cell which holds or glues the different neighboring cells together?

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

The minute protoplasmic connections between cells are called

The secondary cell wall is formed by the deposition of which substance on the primary cell wall?

What does the cell wall exhibit?