Question

Which is not a polysaccharide?
A. Sucrose
B. Starch
C. Glycogen
D. Cellulose

Answer 1

Hint: Polysaccharides are long chains of monosaccharides. Polysaccharides are further classified into three types namely, structural polysaccharides, food storage polysaccharides, and mucopolysaccharides.

Complete answer:
a) Sucrose – Sucrose is a type of disaccharide. Disaccharides are compounds made up of two monosaccharides. Sucrose is made up of two monosaccharides that are glucose and fructose. It is also known as cane sugar because it is found in sugarcane. Sucrose is the only non-reducing sugar. Apart from sucrose, all sugars are reducing in nature.
b) Starch – Starch is a type of food storage polysaccharide. It is made up of amylose and amylopectin. The starch reserves food for the plant body. Starch is reduced by iodine. It is the third most abundant carbohydrate.
c) Glycogen – Glycogen is a type of food storage polysaccharide. It is made up of amylose and amylopectin. The glycogen reserves food for the animal body. Some protozoans also store glycogen. It is the fourth most abundant carbohydrate.
d) Cellulose – Cellulose is a type of structural polysaccharide. Cellulose is found in the grass. It is made up of six thousand molecules of unbranched chains of beta glucose. It is the most abundant carbohydrate.
Hence, the correct answer is option A.

Note: Sucrose is a type of oligosaccharide. Oligosaccharides are those compounds that are made up of two to nine monosaccharide units. Disaccharide is a subclass of oligosaccharides. Compounds with more than ten monosaccharide units are classified under polysaccharides.