Match List-I with List-II.
| List-I (Polysaccharide) | List-II (Feature) |
|---|---|
| (A) Amylose | (I) Straight chain polysaccharide composed only of β-D-glucose units |
| (B) Amylopectin | (II) Present in liver, muscles and brain; structure similar to amylopectin but more highly branched |
| (C) Cellulose | (III) Water soluble, unbranched chain of α-D-glucose units joined by C1–C4 glycosidic linkage |
| (D) Glycogen | (IV) Water insoluble polymer of α-D-glucose units, branched through C1–C6 glycosidic linkage |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-III, B-IV, C-I, D-II
All four polysaccharides are made of glucose units joined by glycosidic linkages. They differ in the form of glucose (α or β), in branching and in where they occur.
(A) Amylose — This matches (III). Amylose is the water soluble component of starch (about 15–20%), a long unbranched chain of α-D-glucose units with C1–C4 linkages.
(B) Amylopectin — This matches (IV). Amylopectin is the insoluble component of starch (about 80–85%); its chain grows by C1–C4 linkages and branches by C1–C6 linkages.
(C) Cellulose — This matches (I). Cellulose is a straight chain of β-D-glucose units, joined C1 to C4; it is the main constituent of plant cell walls.
(D) Glycogen — This matches (II). Glycogen is the carbohydrate stored in the animal body; it is called animal starch because it is like amylopectin, only more highly branched.
NCERT (2026-27 edition):
10.1.4 Polysaccharides – “Amylose is water soluble component which constitutes about 15-20% of starch. Chemically amylose is a long unbranched chain with 200-1000 α-D-(+)-glucose units held together by C1– C4 glycosidic linkage.”
“Amylopectin is insoluble in water and constitutes about 80- 85% of starch. It is a branched chain polymer of α-D-glucose units in which chain is formed by C1–C4 glycosidic linkage whereas branching occurs by C1–C6 glycosidic linkage.”
“…Cellulose is a straight chain polysaccharide composed only of β-D-glucose units which are joined by glycosidic linkage between C1 of one glucose unit and C4 of the next glucose unit.”
“(iii) Glycogen: The carbohydrates are stored in animal body as glycogen. It is also known as animal starch because its structure is similar to amylopectin and is rather more highly branched. It is present in liver, muscles and brain.”