Chitin is also found in the cell walls of fungi.
The exoskeleton of Arthropods is made up of Chitin.
(A) Hyaluronic Acid - Incorrect: This is a component of animal connective tissue, not exoskeletons.
(B) Chitin - Correct: Arthropod exoskeletons consist of chitin, a nitrogen-containing polysaccharide.
(C) Waxes - Incorrect: While waxes may coat the exoskeleton, they're not its structural component.
(D) Cellulose - Incorrect: This is the plant cell wall component, not found in arthropods.
The correct answer is (B) Chitin, the characteristic tough polysaccharide in arthropod cuticles.
The exoskeleton of arthropods (such as insects, crustaceans, and arachnids) is primarily made of chitin, a complex polysaccharide. Chitin is tough, flexible, and provides both strength and rigidity to the exoskeleton.
Other options:
Option (B) is correct as chitin forms the exoskeleton of arthropods.
| Column I | Column II | ||
|---|---|---|---|
| 1. | Calotropis | p. | Invertebrates |
| 2. | Pisaster | q. | Distasteful |
| 3. | Monarch butterfly | r. | Cryptically colored |
| 4. | Frogs | s. | Cardioglycoside |
Match Column I and Column I
| Column I | Column II | ||
|---|---|---|---|
| 1 | Narrowly utilitarian argument | p | Conserving biodiversity for major ecosystem services |
| 2 | Broadly utilitarian argument | q | Every species has an intrinsic value and moral duty to pass our biological legacy in good order to future generation. |
| 3 | Ethical argument | r | Receiving benefits like food, medicine & industrial products. |