These are permanent tissue whose cells are similar in structure and function
I. 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.