Quiz on Mollusks and Echinoderms

Which of the following is NOT a characteristic of mollusks?

• Soft, unsegmented bodies

• Radial symmetry

• A muscular foot for movement

• A mantle that may secrete a shell

How do bivalves like clams and mussels feed?

• Using a radula to scrape food from surfaces

• By capturing prey with tentacles

• Through filter-feeding with siphons

• By swallowing food whole with their beak

What is the function of the water-vascular system in echinoderms?

• Protecting internal organs

• Facilitating movement, feeding, and respiration

• Generating ink to deter predators

• Filtering food from water

Which class of mollusks includes squid and octopuses?

• Gastropoda

• Bivalvia

• Cephalopoda

• Polyplacophora

What type of symmetry do adult echinoderms possess?

• Asymmetry

• Bilateral symmetry

• Radial symmetry

• Symmetry varies between species

Which of the following is a characteristic of chitons?

• They are 'head-footed' mollusks with tentacles.

• They cling tightly to rocks using a large muscular foot.

• They have a single, coiled shell.

• They filter-feed by pumping water through their valves.

What do tube feet in echinoderms help with?

Which is a key difference between mollusks and echinoderms?

• Mollusks use gills for breathing, while echinoderms use lungs.

• Mollusks can live on land, while echinoderms are exclusively marine.

• Mollusks have radial symmetry, while echinoderms have bilateral symmetry.

• Both phyla have water-vascular systems for movement.

How do cephalopods like squids move quickly through water?

• By contracting their muscular foot

• By using jet propulsion

• By swimming with fins

• By extending and retracting their tube feet

Which feature is unique to echinoderms and not found in mollusks?

• Shell secretion by the mantle

• Water-vascular system for movement

• Advanced eyesight

• Radula for feeding