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  4. In woody trees, the exchange of gases between the outer atmosphere and the internal tissue of the stem takes place through:

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Q. In woody trees, the exchange of gases between the outer atmosphere and the internal tissue of the stem takes place through:

KEAMKEAM 2010Anatomy of Flowering Plants

Solution:

Lenticels are the raised pores in the stems of woody plants that allow gas exchange between the atmosphere and the internal tissues. The pore is formed by the cork cambium, which, at certain points, produces a loose bulky form of cork that pushes through the outer tissues to create the lenticel