Question

what is the chemical substance that makes the cells of sclerenchyma hard mention where the tissue is likely to be present

Answer 1

substance is lignin

present in stems, around vascular bundles, in the veins of leaves and in the hard covering of seeds and nuts.

Answer 2

lignin

Sclerenchyma tissue possesses long, narrow cells with thickened walls. They possess secondary walls made of lignin. Lignin is a chemical substance, which acts as cement and hardens them