Answer :
In the woody stems and origins of dicotyledonous flowering plants, there is a special organ called LENTICEL will be present inside through which the gaseous exchange takes place regularly.
The one or more pores available on the stems of these woody plants allow this gas exchanges to takes place between the internal tissues and atmosphere.
The outer layer of woody stem has small holes called lenticels which perform exchange of gases.
Lenticels are raised surface on the bark made up of porous tissues composed of cells with large inter-cellular spaces. These cells have large inter-cellular spaces so that they can exchange gases between the plant and the environment.