Lentides are loosely arranged areas in the periderm

Lentides are loosely arranged areas in the periderm.
(i) How these are formed?
(ii) What are their numbers7
(iii) How the lenticels help the plants? no?

(i) Due to more activity of certain portions of phellogen, the phellem cells are cut off very rapidly and hence, these cells are loosely arranged with a lot of intercellular spaces. These loosely arranged cells are called complementary cells and loosely arranged areas in the periderm are called lenticels.
(ii) The number of lenticels formed in a stem is variable.
(iii) Lenticels help in
(a) gas exchange. (b) lenticular transpiration and explain.