Question

Why sclerenchyma cells so
hard

Answer 1

cells of sclerenchyma have a tough protein called lignin in their cell walls this give structural strength to them all the cells of sclerenchyma tissues are dead this is the reason they are hard

Answer 2

Sclerenchyma cells are specialized plant cells that exist to provide strength and support. They are present in all kinds of plants including grasses, trees, and flowering plants.

so sclerechyma cells are hard.