Invertebrates – True or false

Invertebrates do not have bones. Instead, many are supported by exoskeletons. Those living in aquatic environments often rely on a hydrostatic skeleton, which is a fluid-filled cavity surrounded by muscles, providing structural support.

What is a characteristic feature of invertebrates?

• They have a backbone.

• They lack bones.

• They have a fluid-filled cavity.

• They are always aquatic.

Which structure supports many invertebrates?

• Exoskeleton

• Hydrostatic skeleton

• Cartilage

• Endoskeleton

What is a hydrostatic skeleton?

• A type of cartilage

• A structure made of bones

• A fluid-filled cavity surrounded by muscles

• A rigid external shell

Which of the following is NOT a support structure for invertebrates?

• Fluid-filled cavity

• Endoskeleton

• Hydrostatic skeleton

• Exoskeleton

In which environment are hydrostatic skeletons commonly found?

• Forest

• Mountains

• Desert

• Sea