Question

The exoskeleton of arthropods is made up of which material?
(a)Chitin
(b)Cuticle
(c)Suberin
(d)Mucopolysaccharides

Answer 1

Hint: It is a long-chain polymer containing N-acetylglucosamine, a glucose derivative. This polysaccharide is a primary component of fungal cell walls, arthropod exoskeletons such as crustaceans and insects, mollusc radulae, cephalopod beaks, and fish and amphibian scales.

Complete answer:
Arthropod bodies are supported by chitin-composed external bones or hardened exoskeletons. It is formed by their skin to form a protective outer covering that hardens. The exoskeleton is a non-living compound that offers protection and prevents the body from losing water.

Additional Information:
A cuticle, or cuticula, is any of a number of defensive, tough yet flexible, non-mineral external coverings of an organism or parts of an organism. Different forms of "cuticle" are non-homologous, varying in origin, structure, function, and chemical composition.
Suberin is a lipophilic macromolecule found in specialized plant cell walls where the environment needs insulation or protection. The periderm, the tissue that envelops secondary stems as part of the bark, is produced by suberized cells and grows after wounding or leaf abscission as the sealing tissue.
Mucopolysaccharides are long chains of sugar molecules, mostly in mucus and fluid around the joints, that are found throughout the body. More generally, they're called glycosaminoglycans.
So, the correct answer is ‘chitin’.

Note: Chitin is a big, structural polysaccharide made of altered glucose chains. Chitin is present in insect exoskeletons, fungal cell walls, and in invertebrates and fish in some hard structures. Chitin, in terms of abundance, is second only to cellulose.