Question

which is a protective tissue composed of dead cells​

Answer 1

Sclerenchyma tissue composed of dead cells

Answer 2

Sclerenchyma tissue, when mature, is composed of dead cells that have heavily thickened walls containing lignin and a high cellulose content (60%–80%), and serves the function of providing structural support in plants. Sclerenchyma cells possess two types of cell walls: primary and secondary walls.