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Main gas exchange organs of plants

Write down the main gas exchange organs of plants? How is the procedure accomplished?

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

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