Exploring Echinoderms: The Wonders of Marine Life

What unique body symmetry is common to all echinoderms?

• Six-part symmetry

• Three-part symmetry

• Four-part symmetry

• Five-part symmetry

Which structure in echinoderms acts similarly to a brain?

• Cerebral cortex

• Central ganglion

• Spinal cord

• Nerve ring

What is the primary diet of sea urchins?

• Coral reefs

• Seaweed and algae

• Plankton

• Small fish

How do sea cucumbers contribute to their ecosystem?

• By cleaning organic matter from sand

• By preying on small fish

• By producing oxygen through photosynthesis

• By providing shelter to small marine life

What is the primary method by which brittle stars capture their food?

• Waving arms to catch plankton

• Using a suction mechanism

• Emitting bioluminescent light to attract prey

• By burrowing into sand

What powers the movement of a sea star's tube feet?

• Electrical impulses

• Muscular contraction

• Hydraulic pressure

• Chemical reactions

What sensory capability do the tips of a sea star's arms have?

• Taste

• Light detection

• Smell

• Hearing

How do sea stars open the shells of their prey?

• With strong acidic secretions

• By applying hydraulic pressure

• Using sharp teeth

• Through electric shocks

What unusual method do sea stars use to digest their food?

• Swallowing whole

• External digestion

• Enzymatic breakdown inside the body

• Filter feeding

What evolutionary advantage do echinoderms have?

• Long lifespan

• Camouflage skills

• Ability to regenerate limbs

• High-speed movement