On the bark of woody plants, there is some lens-shaped or egg-shaped pores present called lenticel.
i) For the convenience of gaseous exchange cork cambium, in different places, produces thin-walled round parenchymatous cells instead of cork tissue.
ii) Due to the formation of parenchymatous cells, cell division occurs rapidly in them. Thus, a pressure falls on epidermal tissue and the epidermal cells rupture and form lens-shaped pores
iii) The parenchymatos cells below the lens-shaped pores are known as complementary cells. These lens-shaped pores and the area of complementary cells lying below the lens-shaped pores are known as lenticels.
i) The main function of lenticel is to perform gaseous exchange between air and inner tissues.
ii) Often a little transpiration may occur through lenticel.