Q.136 in most woody trees, at certain regions, the phellogen cuts off closely arranged parenchymatous cells on the outer side instead of cork cells. These parenchymatous cells soon rupture the epidermis forming a lens-shaped openings called
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The lens shaped opening is called lenticels . The lenticels help in the gaseous exchange between the outer atmosphere and the internal tissue of the stem.
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lenticals is the answer
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