LIFE SCIENCE

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.

Detailed explanation-2: -It is mainly composed of cellulose, long fibres of carbohydrates including hemicellulose, lignin and pectin. The main functions of the cell wall are: Protecting the cell against physical damage and invading pathogens.

Detailed explanation-3: -a) Primary wall – It is composed mainly of cellulose. It has higher cellulose content than any other cell walls. b) Secondary wall – It is mainly composed of hemicellulose and pectin.

Detailed explanation-4: -The cell walls of most algae and higher plants are composed principally of cellulose, which is the single most abundant polymer on Earth. Cellulose is a linear polymer of glucose residues, often containing more than 10, 000 glucose monomers.