AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Solution : The husks of cotton that are used in making strings and ropes are made up of phloem fibres.

Detailed explanation-3: -The xylem vessels and tracheids are sclerenchymatous cells. They form the hypodermis of some xerophytic plants and reduce water loss. Many fibres such as bast fibres, seed hairs are used as raw materials for textiles.