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  4. In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through :

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Q. In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through :

Haryana PMTHaryana PMT 2004

Solution:

Mature stems of woody plants have a peripheral water proof tissue called cork (Phellum). A number of scars found on the surface of cork known as lenticels. Lenticels allow the gaseous exchange between the atmosphere and living cells below the cork.