Which of the following statement$(s)$ is/are true?
$(A)$ Uneven thickening of cell wall is characteristic of sclerenchyma. 
$(B)$ Periblem forms cortex of the stem and the root.
$(C)$ Tracheids are the chief water transporting elements in gymnosperms.
$(D)$ Companion cell is devoid of nucleus at maturity.
$(E)$ The Commercial cork is obtained from Quercus suber

In stem which layer forms epidermal tissues

Ring bark is present in

Presence of vessel in the wood is