Which of the following statement(s) is/are correct ? (i) Uneven thickening of cell wall is characteristic of sclerenchyma. (ii) All tissues on the innerside of the endodermis constitute the stele. (iii) Tracheids are the chief water transporting elements in gymnosperms. (iv) Companion cell is devoid of nucleus at maturity. (v) Bark refers to a number of tissue types, viz., periderm and secondary phloem.