Composition of bade and its functions

composition of bade and its functions. From which plant the commercial cork is obtained?

All tissues outside the vascular cambium constitute the bark. It includes periderm, primary cortex, pericycle, primary and secondary phloem. The cavities of cork cells are filled with air which makes file cork light in weight. It provides protection and have thermal insulating properties. (1 +1) , The commercial cork is obtained from Quercus sober.