What does the term echinoderm mean?

• tube feet
• star shaped
• spiny skin
• stomach foot

What internal system of canals and external tube feet help echinoderms move and feed?

• gastrovascular cavity
• water vascular system
• hydrostatic skeleton
• cardiovascular system

Which of the following organisms is NOT an echinoderm?

• sea cucumber
• sand dollar
• nudibranch
• brittle starfish

With regard to body cavities, how are echinoderms classified?

• Deuterostome coelomate
• Protostome coelomate
• Deuterostome acoelomate
• Protostome acoelomate

By what process will starfish regrow an arm torn off by a predator?

• Reconstructive meiosis
• Regeneration
• Tissue regenesis
• Mitotic restoration

What type of skeleton do echinoderms have?

• Exoskeleton
• Hydrostatic skeleton
• Endoskeleton
• Mesenteric skeleton

What is the primary component of an echinoderm's skeleton?

• Spicules of chitin plates
• Ossicles of chitin plates
• Spicules of calcium carbonate
• Ossicles of calcium carbonate

What type of symmetry do larval echinoderms exhibit?

• Asymmetry

• Radial symmetry
• Bilateral symmetry
• Trilateral symmetry

What type of symmetry do adult echinoderms exhibit?

• Asymmetry
• Radial symmetry
• Bilateral symmetry
• Trilateral symmetry

How do echinoderms excrete nitrogenous waste from their bodies?

• through diffusion
• through nephridia
• through respiratory trees
• through dermal gills