The middle lamella is composed of which substance?

Give information about the chemical composition and function of the cell wall.

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.

Elementary fibrils of cellulose are also known as

Chlor-zinc iodide ($Schulze's$ solution) stains which of the following?

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