How does a tree trunk exchange gases with the environment although it lacks stomata?

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Solution

Lenticels:

Lenticels are intercellular spaces present in the periderm of the trunk.

Function of Lenticels:

Lenticles allow the exchange of gases such as $C O_{2}$ and $O_{2}$ in the trunk of the plant where stomata is not present.

Final answer: Lenticels

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