Which tissue make sthe plant hard and stiff and what is the unique property of this tissue?

Sclerenchyma is the simple permanent tissue that makes the plant hard and stiff. It provides mechanical strength to a plant. It consists of long and narrow dead cells.The cells of this tissue are thick-walled due to the deposition of lignin. There are no intercellular spaces due to presence of thickened wall.  This tissue is found  in stems around the vascular bundles, in the veins of leaves and in the hard covers of  seeds and nuts, husk of a coconut, etc. 

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