permit the exchange of gases between the atmosphere and the internal tissue of the stem. They occur in most woody trees.

Cork

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Lenticels

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Guard cells

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Soft wood

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Solution

The correct option is B Lenticels
In certain regions parenchymatous cells rupture the epidermis, forming a lens shaped openings called lenticels. These permit the gaseous exchange between the outer atmosphere and the internal tissue of the stem.

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