Question

Select the correct statement about skeletal system in some animals.

• A. Snails and sharks have only a skeleton outside their body i.e., an exoskeleton.
• B. Earthworms have liquid skeleton i.e., the liquid trapped in body spaces keeps the body firm.
• C. Snakes and birds have hollow bones which reduces their body weight and makes movement easier.
• D. Cockroaches have an endoskeleton made of chitin

Answer 1

The correct option is B

Earthworms have liquid skeleton i.e., the liquid trapped in body spaces keeps the body firm.

• Worms do not have bones. They have liquid trapped in spaces inside the body. The muscles squeeze against the liquid, which keeps their body firm.
• Snails have exoskeletons and sharks have endoskeletons.
• Birds have hollow bones but not snakes.
• Cockroaches have an exoskeleton made of chitin but not an endoskeleton.