What are the main gas exchange organs of the plants? How is the process accomplished?
In the covering of the leaves and of the primary structure of the stem gas exchange is made by the cuticle and pores of the epidermis. In the covering of the secondary structure of the stem of woody plants gas exchange is made by the lenticels of the periderm (small breaches of the cork). The gas exchange in plants is accomplished by simple diffusion.
Plant Physiology - Image Diversity: plant cuticle lenticels