$(i)$ Location : It is located in main cortex of ground tissue of sunflower stem.

$\Rightarrow$ Function : Resin secreting from it gives mechanical strength and durability to stem.

$(ii)$ Location : Unthickened cells in endodermis of maize root.

$\Rightarrow$ Function : It transports water and salts between cortex and stele.

$(iii)$ Location : It is present in phloem tissue of gymnosperms.

$\Rightarrow$ Function : It lacks sieve tube and companion cells but it has albumin cells and sieve cells.