U10D2 Mollusks

Multiple Choice

Which of the following characteristics is true for all invertebrates?

• They have a backbone

• They live only in shallow water

• They lack a vertebral column

• They are all microscopic

Multiple Select

Select all the organ systems that are present in more complex invertebrates.

• Digestive system

• Nervous system

• Circulatory system

• Respiratory system

Open Ended

How does the method of locomotion reflect an invertebrate's body structure and lifestyle?

Open Ended

Explain how the mantle contributes to both protection and movement in different types of mollusks.

Multiple Select

Which of the following are functions of the radula in mollusks?

• Scraping food from surfaces

• Tearing apart prey

• Creating an external shell

• Grazing on algae and plants

Multiple Choice

Which of the following is NOT a characteristic of bivalves?

• They have a radula for feeding.

• They have two hinged shells.

• They reproduce through external fertilization.

• They use a muscular foot to burrow.

Multiple Choice

Which of the following is NOT a characteristic of cephalopods?

• Highly developed nervous systems

• External shell for protection

• Possession of chromatophores

• Active predators with excellent vision

Open Ended

Describe two ways in which sponges differ from mollusks in terms of body structure and function.

Multiple Choice

Pearl formation in mollusks begins when a foreign object enters the shell. Which of the following substances is NOT involved in the creation of nacre (mother-of-pearl)?

• Aragonite

• Conchiolin

• Calcium carbonate

• Silica

Multiple Choice

Which of the following is a key difference between Porifera and Mollusks?

• Porifera have well-developed organ systems, while mollusks do not.

• Mollusks are asymmetrical, while Porifera are bilaterally symmetric.

• Porifera lack true organs, while mollusks have well-developed organ systems.

• Both Porifera and mollusks have calcium carbonate shells.

Open Ended

Reflecting on today's lesson about marine invertebrates, what is one new thing you learned about how scientists classify these animals?