Ncert Exercises & Solutions

Starch, cellulose, glycogen, chitin are polysaccharides found among the following. Choose the one appropriate and write against each.

Cotton fibre ................

Exoskeleton of cockroach ................

Liver ................

Peeled potato ................

(a) Cotton fibre — Cellulose

(b) Exoskeleton of cockroach — Chitin

(d) Peeled potato — Starch

Cellulose is a long chain of linked glucose molecules and is the main component of plant cell walls. Cotton is the purest natural form of cellulose: the cellulose content of cotton fibre is 90%.

Chitin is a long chain polymer that forms the hard part of the outer integument or exoskeleton of crustaceans and insects such as cockroach. It is also the main component of the cell walls of fungi.

Glycogen is a multibranched polysaccharide of glucose acting as a form of stored energy in the liver of animals. It is also found in some stored fungi.

Starch is a carbohydrate consisting of along chain of glucose units joined by glycosidic bonds. This polysaccharide is produced mostly by green plants for energy storage, e.g., peeled potato.

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