Question: 113: Exoskeleton of arthropods is composed of :
(1) Chitin
(2) Glucosamine
(3) Cutin
(4) Cellulose
Answer: Option (1)
Explanation:
Arthropods possess a hard external covering known as an exoskeleton.
This exoskeleton is primarily made up of chitin, which is a tough, flexible polysaccharide.
Chitin provides mechanical strength and protection to the body and also prevents excessive loss of water.
Glucosamine is a component of chitin but does not independently form the exoskeleton.
Cutin is a waxy substance found in the cuticle of plant epidermis.
Cellulose is the main structural component of plant cell walls.
Therefore, the correct answer is Option (1).