NEET BIOLOGY

Detailed explanation-1: -The cell wall is composed of a network of cellulose microfibrils and cross-linking glycans embedded in a highly cross-linked matrix of pectin polysaccharides. In secondary cell walls, lignin may be deposited.

Detailed explanation-2: -Lignin, a complex phenylpropanoid polymer, is primarily deposited in the walls of cells that have secondary wall thickening, such as tracheary elements and fibers. Lignin provides mechanical strength in the walls of these sclerenchyma cells.

Detailed explanation-3: -Cell Walls The cell wall is composed of the glucose polysaccharide cellulose. The woody parts of trees and certain other plants have a secondary cell wall that contains another polymeric material called lignin.

Detailed explanation-4: -Lignin is one of the main components of plant cell wall and it is a natural phenolic polymer with high molecular weight, complex composition and structure.

Detailed explanation-5: -Lignin deposition generally occurs when cell growth is completed and the cell wall undergoes secondary thickening. The secondary cell wall provides the strength necessary to make cells suitable for transport and support.