$(a)$ What is the function of the tissue present in the bark of a tree?
$(b)$ Which substance is present in the adipocyte? How does it help?

(N/A) $(i)$ The bark of a tree consists of dead cells that are compactly arranged without intercellular spaces.
$(ii)$ Their cell walls contain a chemical substance called suberin,which makes them impervious to gases and water.
$(iii)$ It serves as an outer protective layer for the plant.
$(b)$ Adipocytes are fat-storing cells.
$(i)$ These cells are found below the skin and between internal organs.
$(ii)$ The cytoplasm of these cells is filled with fat globules.
$(iii)$ They act as an insulator because they store fat,which helps in conserving body heat.