Identify the location and function of the following structures:
$(i)$ Resin duct
$(ii)$ Passage cells
$(iii)$ Albumin cells

(N/A) $(i)$ Resin duct:
Location: Found in the cortex of gymnosperm stems (e.g.,Pinus).
Function: Secretes resin,which provides mechanical strength and protection against pathogens.
$(ii)$ Passage cells:
Location: Thin-walled cells present in the endodermis of roots,opposite to protoxylem.
Function: Facilitate the radial transport of water and dissolved minerals from the cortex to the stele.
$(iii)$ Albumin cells:
Location: Present in the phloem of gymnosperms.
Function: Associated with sieve cells; they perform metabolic functions similar to companion cells in angiosperms.