Question

why do some animals undergo ecdysis or moulting?

Answer 1

This process is called ecdysis. It is commonly said that ecdysis is necessary because the exoskeleton is rigid and cannot grow like skin, but this is simplistic, ignoring the fact that most Arthropoda with soft, flexible skins also undergo ecdysis. While moulting, insects can't breathe.

Answer 2

• Ecdysis or moulting is the process in which some invertebrates routinely cast off a part of their body either at specific times of a year or at a specific point in their lives.
• Moulting involves the shedding of the epidermis(skin), pelage(hair, fur, wool, feather), and exoskeleton in arthropods
• In arthropods, moulting is the casting off of the exoskeleton for growth. This process is known as ecdysis. The exoskeleton is a rigid structure and does not grow hence moulting is important for metamorphosis.
• Reptiles like snakes and lizards shed off the upper layer of skin
• Birds shed off their old feathers while producing new ones.
• Adult birds molt once a year.

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