Question

due to which layer tha wall of sclernchyma tissue are thicket​

Answer 1

Sclerenchyma, in plants, support tissue composed of any of various kinds of hard woody cells. Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. ... Unlike collenchyma, mature cells of this tissue are generally dead and have thick walls containing lignin.

Answer 2

Due to the presence of lignin, the walls of sclerenchyma tissue are thickest.