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. It is mostly sessile and filter feeds using gills. To which class does this organism most likely belong?

Accepted Answer

Bivalvia

Question 4

Which of the following best describes the circulatory system of most mollusks, except cephalopods?

Accepted Answer

Open circulatory system with hemolymph pumped into a hemocoel

Question 5

Which adaptation allows cephalopods to move rapidly through water?

Accepted Answer

Jet propulsion using a siphon formed from the mantle

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 with a single, often coiled shell, chemosensory antennae, and a lung for breathing is most likely a member of which class?

Accepted Answer

Gastropoda

Question 8

Which structure in mollusks is responsible for secreting the shell?

Accepted Answer

Mantle

Question 9

Some nudibranchs (sea slugs) can store cnidocytes from their prey. What is the primary function of these stored cnidocytes?

Accepted Answer

Defense against predators

Question 10

Which of the following is a unique feature of cephalopods compared to other mollusks?

Accepted Answer

Closed circulatory system

Question 11

A chiton is found to have hundreds of small, light-sensitive structures embedded in its shell. What is the function of these structures?

Accepted Answer

Forming low-resolution images for environmental awareness

Question 12

Which of the following best explains why most gastropod shells are 'right-handed' (dextral)?

Accepted Answer

Mosaic cleavage during development

Question 13

Which class of mollusks is known for having a highly developed nervous system, complex eyes, and the ability to change color and texture?

Accepted Answer

Cephalopoda

Question 14

Which of the following is NOT a characteristic of bivalves?

Accepted Answer

Presence of a radula

Question 15

Which of the following equations best represents the process of aerobic cellular respiration, which occurs in the mitochondria of mollusks?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$$

Question 16

Which of the following best describes the function of nephridia in mollusks?

Accepted Answer

Waste excretion and osmoregulation

Question 17

A scientist discovers a marine animal with a single shell, a muscular foot, and chemosensory tentacles. It is an active predator and produces toxins. Which class does it most likely belong to?

Accepted Answer

Gastropoda

Question 18

Which of the following is a major evolutionary advantage of the closed circulatory system found in cephalopods?

Accepted Answer

Allows for more efficient oxygen delivery to active tissues

Question 19

Which of the following best describes the fate of the blastopore in deuterostome development?

Accepted Answer

Blastopore becomes the anus

Question 20

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

Accepted Answer

The development of complex eyes in cephalopods and vertebrates

Phylum Mollusca: Structure, Diversity, and Evolutionary Traits

Guida di studio - Domande di pratica

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