(i) Glycogen is also known as animal starch and it is the reserve of carbohydrates in animals. It occurs in algae, fungi and yeasts. Glycogen is dextro-rotatory and its hydrolysis yield D- glucose.
(ii) Chitin : It is hard,tough substance that occurs widely in nature particulary in the shells of arthropods such as crab, insects and spider. The walls of hyphae are composed of slightly different chitin. Chemically, chitin is a polysaccharide drived from glucose.
