Question 1

Which of the following is a synapomorphy (shared derived trait) of the phylum Mollusca?

Accepted Answer

Radula used for feeding

Question 2

Which class of Mollusca is characterized by a shell divided into 7 or 8 dorsal plates and a strong ability to suction to rocks?

Accepted Answer

Polyplacophora

Question 3

A student observes a mollusk with no head, two shells, and no radula. Which class does this organism most likely belong to?

Accepted Answer

Bivalvia

Question 4

Which of the following best describes the circulatory system of most mollusks?

Accepted Answer

Open circulatory system with hemolymph pumped into a hemocoel

Question 5

Which adaptation is unique to cephalopods among mollusks?

Accepted Answer

Tentacles derived from the foot

Question 6

Which of the following is TRUE about the development of protostomes?

Accepted Answer

The blastopore becomes the mouth

Question 7

A terrestrial mollusk is found with a reduced shell and chemosensory antennae. To which class does it most likely belong?

Accepted Answer

Gastropoda

Question 8

Which of the following is a function of the mantle in mollusks?

Accepted Answer

Secreting the shell

Question 9

Which class of mollusks is known for having a closed circulatory system and highly developed eyes?

Accepted Answer

Cephalopoda

Question 10

Which of the following best explains why some nudibranchs (sea slugs) can store cnidocytes from their prey?

Accepted Answer

They use them for defense against predators

Question 11

Which of the following is a correct pairing of mollusk class and feeding adaptation?

Accepted Answer

Cephalopoda – beak for predation

Question 12

Which of the following is a real-world example of convergent evolution in mollusks?

Accepted Answer

The eyes of cephalopods and vertebrates

Question 13

A scientist discovers a mollusk with hundreds of small eyes made of calcium carbonate on its shell. Which class does this organism belong to?

Accepted Answer

Polyplacophora

Question 14

Which of the following is NOT a characteristic of bivalves?

Accepted Answer

Presence of a radula

Question 15

Which of the following best describes the process of torsion in gastropods?

Accepted Answer

The visceral mass twists, bringing the mantle cavity above the head

Question 16

Which of the following equations best represents the relationship between surface area (A) and volume (V) for a spherical mollusk shell of radius $$r$$?

Accepted Answer

$$A = 4\pi r^2$, V$$ = \frac{4}{3}\pi $$r^3$$

Question 17

Which of the following is a major evolutionary advantage of the coelom in triploblastic animals?

Accepted Answer

It provides a hydrostatic skeleton and space for organ development

Question 18

Which of the following best explains why cephalopods are considered highly intelligent among invertebrates?

Accepted Answer

They possess a large brain and can solve problems

Question 19

Which of the following is a correct description of the fate of the blastopore in deuterostomes?

Accepted Answer

Blastopore becomes the anus

Question 20

Which of the following is a real-world application of mollusk research in technology or medicine?

Accepted Answer

Studying chiton eyes for biomimetic materials

Phylum Mollusca and Protostome Diversity: Structure, Function, and Evolution

Guida di studio - Domande di pratica

Study guide - Flashcard