DENDROLOGY

Detailed explanation-1: -A unique character found only in the Arthropods is a chitin ous exoskeleton. Arthropods e.g., insects, crabs, lobsters etc. are covered with a tough, resilient integument or exoskeleton of chitin.

Detailed explanation-2: -An exoskeleton is a key feature of arthropods, a category of animals that includes insects, spiders, and crustaceans. Grasshoppers, cockroaches, ants, bees, cicadas, scorpions, lobsters, shrimp, black widows, snails and crabs are all examples of animals with exoskeletons.

Detailed explanation-3: -Spiders, centipedes, crabs, snails, and lobsters all have a kind of external armour. Some creatures can outgrow their exoskeletons – a rigid exoskeleton can prevent development, so some creatures will shed their armour and grow it again. This process is called ecdysis, or ‘molting’.

Detailed explanation-4: -Unlike you and me, who have a rigid skeleton inside our bodies to hold us together, lobsters have a rigid shell on the outside of their bodies called an exoskeleton.