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?

Fill in the Blanks

Asexual reproduction in some invertebrates produces identical

.

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

Fill in the Blanks

Gastropods use their

to move along surfaces.

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

Fill in the Blanks

In mollusks, the process of internal fertilization is primarily found in

.

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?