Q.75 Match List I with List II
| LIST I | LIST II |
|---|---|
| A. Glycogen B. Starch C. Cellulose D. Chitin | I. Cell wall of plants II. Carbohydrate storage in animals III. Carbohydrate storage in plants IV. Cell wall of fungi |
Choose the correct answer from the options given below:
- (A)–(II); (B)–(III); (C)–(I); (D)–(IV)
- (A)–(I); (B)–(II); (C)–(III); (D)–(IV)
- (A)–(III); (B)–(II); (C)–(I); (D)–(IV)
- (A)–(IV); (B)–(I); (C)–(II); (D)–(III)
Glycogen stores carbohydrates in animals, starch in plants, cellulose forms plant cell walls, and chitin forms fungal cell walls. The correct option is (A): (A)–(II); (B)–(III); (C)–(I); (D)–(IV).
Question Breakdown
This matching question tests polysaccharide structure-function relationships, a staple in NEET/GATE biochemistry and botany sections.
Individual Matches
A. Glycogen → II. Carbohydrate storage in animals
Glycogen, a highly branched α-glucose polymer, serves as the primary energy reserve in animal liver and muscle.
B. Starch → III. Carbohydrate storage in plants
Starch (amylose + amylopectin) stores glucose in plant plastids like amyloplasts.
C. Cellulose → I. Cell wall of plants
β-1,4-glucose polymer forms straight microfibrils providing plant cell rigidity via H-bonds.
D. Chitin → IV. Cell wall of fungi
N-acetylglucosamine polymer strengthens fungal cell walls and insect exoskeletons.Option Evaluation
Option A-Glycogen B-Starch C-Cellulose D-Chitin Validity Reason First II III I IV True Perfect biological matching. Second I II III IV False Swaps storage roles (Glycogen ≠ plant wall). Third III II I IV False Glycogen ≠ plant storage; Starch ≠ animal. Fourth IV I II III False All mismatched (Chitin ≠ animal storage). Polysaccharide biological roles—glycogen as animal carbohydrate storage, starch for plants, cellulose in plant cell walls, chitin in fungal cell walls—are essential matching questions in competitive exams.
Structure-Function Relationships
Polysaccharide Monomer/Linkage Function (List II) Key Feature A. Glycogen α-glucose, 1→4 & 1→6 II. Animal storage Highly branched (rapid mobilization) B. Starch α-glucose, 1→4 & 1→6 III. Plant storage Amylose (linear) + amylopectin C. Cellulose β-glucose, 1→4 I. Plant cell wall Straight chains, H-bond microfibrils D. Chitin N-acetyl-β-glucosamine IV. Fungi cell wall Exoskeleton strength Exam Memory Aid
α-linkages = storage (glycogen/starch); β-linkages = structure (cellulose/chitin). Glycogen > branched than starch; chitin = cellulose + acetylamine group.
