Question

This is a complex, non-carbohydrate polymer found in cell walls. Its function is to provide stiffness to the cell as in xylem vessels and bark fibres. Name it

• A. Opsonin
• B. Saponin
• C. Lignin
• D. Plant Polypeptide

Answer 1

The correct option is C Lignin

Lignin is a class of complex organic polymers that forms a key structural material in the support tissues of vascular plants and some algae. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically, lignins are cross-linked phenolic polymers. As a biopolymer, lignin is unusual because of its heterogeneity and lack of a defined primary structure. Its most commonly noted function is mechanical support through strengthening of wood in vascular plants.

So the correct option is 'lignin'.