Bark cells are impervious to gases and water.What experiment will you perform to prove this?Its urgent....

Bark cells are mostly impervious to water and gases due to deposition of a material called suberin. However, there are pores at some locations in the bark called lenticels that allow exchange of gases.

 There is no specific experiment to prove this. However, by studying the anatomy of plants, it has been proved that they are impervious to water and gases.

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