What are the major gas exchange organs of the plants, Biology

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What are the major gas exchange organs of the plants? How is the procedure accomplished?

In covering of the leaves and of the primary structure of the stem gas exchange is made through the pores and cuticle of the epidermis. In covering of the secondary structure of the stem of woody plants gas exchange is prepared through the lenticels of the periderm (small breaches of the cork) that the gas exchange in plants is accomplished by simple diffusion.

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