Elementary fibrils of cellulose are also known as

Which of the following is $NOT$ a function of the cell wall?
$(I)$ Provides shape to the cell.
$(II)$ Protects the cell from mechanical damage and infection.
$(III)$ Helps in cell-to-cell interaction.
$(IV)$ Provides a barrier to undesirable macromolecules.
$(V)$ Endosmosis of water.

In the middle lamella of plant cell walls,one of the main elements is

Select the correct combination of the statements regarding the characteristics of the middle lamella:
$a$. It holds the different neighbouring cells together.
$b$. It is composed of $Mg$ pectate only.
$c$. It gets dissolved during the ripening of fruits.
Correct statements is/are:

Plasmodesmata are ........

Write the importance of plasmodesmata.