What type of symmetry does a sea star's body demonstrate?

• Asymmetrical

• Radial symmetry

• Bilateral symmetry

• Spherical symmetry

Where are the skin gills of a sea star located?

• Between the radial arms

• Near the mouth

• On the ventral surface

• Between the spines on the dorsal side

What is the function of the madrepore pore in sea stars?

• Excretion of waste

• Intake of water for the water vascular system

• Secretion of enzymes

• Absorption of nutrients

What tool is used to start the dissection of a sea star's arm?

• Knife

• Forceps

• Scalpel

• Scissors

What material forms the internal skeleton of a sea star?

• Chitin

• Silica

• Calcium phosphate

• Calcium carbonate

From where does food enter the sea star's digestive system?

• Anus

• Cardiac stomach

• Pyloric stomach

• Mouth

What is the function of pyloric caeca in sea stars?

• Muscle attachment

• Storage of nutrients

• Chemical digestion

• Water filtration

How do sea stars primarily move?

• Contracting muscles

• Using tube feet

• Using spines

• Flapping radial arms

What is the primary role of the water vascular system in sea stars?

• Reproduction

• Digestion

• Circulation of water

• Breathing

Can the gender of a sea star be easily determined by its reproductive organs?

• No, they look identical

• Yes, by color differences

• Yes, they are distinctly different

• No, sea stars are asexual