These are permanent tissue whose cells are similar in structure and functionI. Parenchyma    II. Collenchyma    III. Sclerenchyma   IV. Xylem

Permanent tissues whose cells are structurally and functionally similar are called as simple tissues. These are parenchyma, collenchyma and sclerenchyma. Xylem and phloem have structurally and functionally different cells.