Starch,cellulose,glycogen,and chitin are polysaccharides. Match these with the following sources and write the correct pair for each:
$(a)$ Cotton fibre
$(b)$ Exoskeleton of cockroach
$(c)$ Liver
$(d)$ Peeled potato

(A) Cotton fibre consists of cellulose,which is a structural polysaccharide found in plant cell walls.
$(b)$ The exoskeleton of a cockroach is composed of chitin,a nitrogen-containing polysaccharide.
$(c)$ Liver stores glucose in the form of glycogen,which is known as animal starch.
$(d)$ Peeled potato is a rich source of starch,which is the primary storage polysaccharide in plants.