The middle lamella is primarily composed of which substance?

The middle lamella of a plant cell is primarily composed of which of the following?

Which of the following determines the shape of the cells and provides a strong structural support to prevent the bacterium from bursting or collapsing?

Cell wall is absent in:

$P -$ Statement: The middle lamella is composed of cellulose plates.
$Q -$ Statement: During the formation of gametes,cell division occurs by mitosis.

The function of plasmodesmata is: