a. Plasmodesmata
b. Middle lamella
c. Secondary wall
Solution:
a. Plasmodesmata – A cytoplasmic junction between two cells through the cell wall are called Plasmodesmata. With the help of it the symplastic movement takes place.
b. Middle lamella – It is a layer in the cell wall and is made of calcium pectate (mainly) and magnesium pectate.It provides structural support to the plant’s cell wall.
c. Secondary wall – this is a non-extensible layer. It is made of hemicelluloses. It provides rigidity to the cell.