Which of the following vascular bundles are always open?

Which tissue is derived from plerome

Which of the following is made up of dead cells?

The baloon like outgrowth of parenchyma in the lumen of a vessel is known as

In which of the following situations an intercalary meristem can be present

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