Which is not a function of epidermis?

Meristematic tissues in plants are

$(a)$ Differentiate between meristematic and permanent tissues in plants.
$(b)$ Define the process of differentiation.
$(c)$ Name any two simple and two complex permanent tissues in plants.

Fill in the blanks:
$(a)$ Cork cells possess ........... on their walls that make them impervious to gases and water.
$(b)$ .................. have tubular cells with perforated walls and are living in nature.
$(c)$ Bone possesses a hard matrix composed of ............... and ............. .

$(i)$ What is epidermis?
$(ii)$ List three functions of epidermis.

The given diagram shows the longitudinal section of collenchyma tissue. Label the parts '$M$','$N$','$O$',and '$P$' in the given diagram.