BIO Chapter 34

The molluscan class ________ includes the snails and slugs.

gastropoda

If a hiker picked up a mollusk on a trail in a rain forest, what class would it belong to? A. Gastropoda B. Polyplacophora C. Bivalvia D. Cephalopoda

A

Many marine mollusks have distinctive larvae which have their bodies encircled by a row of cilia. These larvae are called A. trochophores. B. miracidia. C. planulae. D. zoecia. E. polyps.

A

Paramecia use cilia for locomotion and for gathering organic matter. How are rotifers similar? A. The corona is made of cilia, and used for swimming and feeding. B. Both lack a gut. C. Rotifers and ciliates are thought to have given rise to all other animal phyla. D. Rotifers are single-celled protists

A

All of the following are either structures or characteristics of members of the Class Bivalvia of the Phylum Mollusca except A. The mantle B. A radula C. A shell D. Gills E. Open circulation

B

Humans have direct development, a closed circulatory system, well-developed eyes, and large brains. Which mollusk also shares these features? A. Nudibranch B. Octopus C. Chiton D. Slug

B

In mollusks, the folds of tissue that arise from the dorsal body wall and enclose a cavity surrounding the visceral mass are called the A. Foot B. Mantle C. Nephridia D. Radula E. Lophophore

B

Inside its beak an octopus has a rasping tongue that is used to tear apart food. Which gastropod structure is this analogous to? A. Nephridium B. Radula C. Shell D. Mantle

B

Paramecia use cilia for locomotion and to gather organic matter. How are rotifers similar? A. Rotifers are single celled B. The corona is used for feeding and swimming C. Paramecia are animals closest relatives D. Both are terrestrial organisms

B

Squids and octopuses move by means of water movement through their a. radula. b. modified mantle cavity. c. muscular foot. d. cilia and flagella. e. tentacles.

B

The cephalopod mollusks have A. A muscular foot B. Tentacles C. Two siphons D. Setae E. Jointed appendages

B

The nitrogenous waste in mollusks is removed by A. Flame cells B. Nephridia C. Malpighian tubules D. Incurrent siphon E. Flagella

B

Trochophores, the free-swimming larvae of many mollusks, are propelled through the water by A. Flagella B. Cilia C. Flame cells D. Nephridia E. The radula

B

Turbellarian flatworms have a distinct head. When compared to the head of an insect, what is the flatworm head missing? A. Sensory organs B. A mouth C. Anterior collection of nerve cells D. Light sensitive structures

B

Which one of the following incorrectly matches a molluscan group with a feature characterizing that group? A. Gastropoda—torsion B. Nudibranchs—extensive gills in mantle cavity C. Bivalvia—reduced head and no radula D. Polyplacophora—eight calcareous plates E. Cephalopoda—closed circulatory system

B

Which one of the following incorrectly matches a molluscan structure with its typical function? A. radula—feeding organ B. ctenidia—secretion of the shell (when present) C. visceral mass—houses organs of digestion, excretion, reproduction D. foot—locomotion E. nephrostome—collection of nitrogenous wastes

B

Why doesn't a tapeworm have a mouth on its scolex? A. The mouth is on the proglottids B. Endoparasites don't need a mouth C. The mouth is located at the end of the pharynx D. Tapeworms use a radula instead of a mouth to feed

B

A marine biologist visits your biology class and begins his talk entitled, "Life as a Trochophore." A friend seated next to you asks, "What is a trochophore?" You explain that a trochophore is A. another name for the veliger stage in the oyster. B. similar to a lophophore, but only found in the phylum Annelida. C. a term used to describe a larval form of either the phylum Mollusca or Annelida. D. another name for the veliger stage in earthworm reproduction. E. a parasite in the intestines of a bivalve mollusk.

C

A snail in your garden and an oyster are quite different in appearance. What would be evidence to justify grouping them together? A. Both have sensory antenna. B. Both use a radula for feeding. C. Both have a mantle capable of secreting calcium carbonate. D. Both use siphons to obtain oxygen.

C

Inside its beak an octopus has a rasping tongue that is used to tear apart food, which gastropod structure is this analogous to? A. Mantle B. Shell C. Radula D. Nephridium

C

Interoctopus communication is facilitated by A. chemical pheromones. B. mantle connections. C. chromatophores. D. a radula.

C

Radula modification allowed all of the following functions in gastropods except A. eating vegetation. B. scraping algae off rocks. C. protecting themselves with nematocysts. D. boring holes in other mollusk shells. E. injecting poison through a harpoon-like structure.

C

Select the mismatched pair of Phylum Mollusca classes and their examples. A. Polyplacophora—chitons B. Gastropoda—slugs C. Bivalvia—snails D. Cephalopoda—nautilus E. Gastropoda—nudibranchs

C

The phylum that includes snails, clams, oysters, and octopuses is the: A. Ectoprocta B. Brachiopoda C. Mollusca D. Annelida E. Phoronida

C

What change would result for a land snail that had a mutation interfering with chitin formation? A. It could not form its exoskeleton. B. Molting would not be possible. C. It would have difficulty feeding. D. It would have a soft, demineralized shell.

C

Which of the following organs of cephalopods resemble those of the vertebrates? A. Arms B. Nephridia C. Eyes D. Digestive tissues E. Foot

C

According to the modern classification scheme, which animal would be a spider's closest relative? A. A snail B. An earthworm C. A tapeworm D. A roundworm E. A squid

D

The rasping tongue, the radula, is present in which molluscan group? A. Bivalve B. Oyster C. Clam D. Snail E. Scallops

D

Turbellarian flatworms have a distict head. When comparted to the head of an insect what is it missing? A. Sensory organs B. Light sensitive structures C. Anterior collection of nerve cells D. A mouth

D

You and your biology lab class take a field trip to a marine aquarium. Your guide is a marine biologist who studies squids. She explains to your class how squids are able to blend into their environment. She points out that squids have pouches of pigments embedded in their epithelium. The pouches are called A. spermatophores. B. phytophores. C. trochophores. D. chromatophores. E. lophophores.

D

A biologist has been studying a mollusk that does not have a shell. It lives in the marine environment. Of the examples given below, which one did the biologist study? A. Clam B. Snail C. Nautilus D. Chiton E. Octopus

E

Examples of mollusks that live on land are the A. Earthworms B. Land crabs C. Mussels D. Scorpions E. Snails and slugs

E

Members of the class _______, which include octopuses, squids, and nautiluses, are highly intelligent.

cephalopoda

In their basic body plan, mollusks have a visceral mass covered with a soft epithelium and a muscular ____ that is used in locomotion.

foot