Answer :
The term bark refers to the several layers of dermal tissue above the epidermis of a woody stem or root . it performs important functions . the dead tissue of the bark form a protective barrier from loss of water , mechanical damages and invasion of parasites and diseases causing organisms . thus we can interpret that bark cells are impervious to gases and water.
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. ♦ in big tress dermal tissue forms several layers above the epidermis it is called bark.
. ♦ The several layers of bark does not allow any things like gases amd water to pass through it.
. ♦ hence bark cells are impervious to gases and water.