The middle lamella is primarily composed of:

In plants,calcium pectate is found in the formation of which structure?

Which one of the following is a non-protoplasmic cell inclusion?

The cell wall of a lignified cell is .........

The element present in the middle lamella is

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.