Question 1

Contrast the various functions of the mantle between Cephalopods and Gastropods.

Accepted Answer

The mantle is responsible for secreting calcium carbonate into the production of the shell of molluscs. In the cephalopods, the mantle cavity is contracted forcefully to generate a jet of water, providing forward propulsion. In other molluscs, such as some snails, the mantle is used for gas exchange.

Question 2

Most intertidal chitons are considered

Accepted Answer

A)  grazers. 
B)  predators. 
C)  scavengers. 
D)  filter feeders. 
E)  infauna. 
A)  grazers. 
B)  predators. 
C)  scavengers. 
D)  filter feeders. 
E)  infauna. A

Question 3

The process by which sea cucumbers protect themselves from predators by releasing their internal organs is called:

Accepted Answer

A)  regeneration. 
B)  cryptic behavior. 
C)  evisceration. 
D)  deposit feeding. 
E)  molting. 
A)  regeneration. 
B)  cryptic behavior. 
C)  evisceration. 
D)  deposit feeding. 
E)  molting. C

Question 4

Match the words with the most closely associated organism.
-Brittle stars

Accepted Answer

A) Bilateral flattened 
B) Five arms attach to central region 
C) Radial oval test 
D) Five arms attach to a round central disk 
A) Bilateral flattened 
B) Five arms attach to central region 
C) Radial oval test 
D) Five arms attach to a round central disk

Question 5

A toothed, biting structure found in the mouths of sea urchins that is used for rasping algae is called:

Accepted Answer

A)  a tube foot. 
B)  Aristotle's lantern. 
C)  a pedicellaria. 
D)  an ambulacral groove. 
E)  a dermal denticle. 
A)  a tube foot. 
B)  Aristotle's lantern. 
C)  a pedicellaria. 
D)  an ambulacral groove. 
E)  a dermal denticle.

Question 6

What ecological roles do burrowing polychaetes play in the marine environment?

Accepted Answer

Many burrowing polychaetes are deposit f

Question 7

Unlike other decapods, hermit crabs are covered by a very thin and light exoskeleton that does not confer much protection against predators. How is this a selective advantage for the hermit crabs?

Accepted Answer

Hermit crabs do not need a very hard exo

Question 8

The tentacles of squids bear hooks, while those of octopus do not.

Accepted Answer

A) True 
 B)False

Question 9

Match the molluscan class with its most closely associated characteristic.
-Cephalopod

Accepted Answer

A) eight plates 
B) head foot 
C) stomach foot 
D) gills strain seawater to collect plankton 
A) eight plates 
B) head foot 
C) stomach foot 
D) gills strain seawater to collect plankton

Question 10

The nephridium of molluscs is part of the:

Accepted Answer

A)  reproductive system. 
B)  excretory system. 
C)  nervous system. 
D)  digestive system. 
E)  defense system. 
A)  reproductive system. 
B)  excretory system. 
C)  nervous system. 
D)  digestive system. 
E)  defense system.

Question 11

Match the molluscan shell layer with its relative position.
-Periostracum

Accepted Answer

A) inner layer 
B) outer layer 
C) middle layer 
A) inner layer 
B) outer layer 
C) middle layer

Question 12

Molluscs with a tubular shell and sheath foot are:

Accepted Answer

A)  scaphopods. 
B)  gastropods. 
C)  bivalves. 
D)  cephalopods. 
E)  nudibranchs. 
A)  scaphopods. 
B)  gastropods. 
C)  bivalves. 
D)  cephalopods. 
E)  nudibranchs.

Question 13

What features of cephalopods have allowed some species to grow to large sizes relative to gastropods?

Accepted Answer

The lack of a shell in these animals mea

Question 14

Even though echinoderms are considered advanced invertebrates, they are radially symmetric in a way similar to the simple cnidarians. What advantage does radial symmetry confer upon echinoderms?

Accepted Answer

Echinoderms are slow moving animals. As

Question 15

Match the molluscan class with its most closely associated characteristic.
-Polyplacophora

Accepted Answer

A) eight plates 
B) head foot 
C) stomach foot 
D) gills strain seawater to collect plankton 
A) eight plates 
B) head foot 
C) stomach foot 
D) gills strain seawater to collect plankton

Question 16

Molluscs having two jointed valves or shells belong to the class:

Accepted Answer

A)  Gastropoda. 
B)  Cephalopoda. 
C)  Bivalvia. 
D)  Polyplacophora. 
E)  Scaphopoda. 
A)  Gastropoda. 
B)  Cephalopoda. 
C)  Bivalvia. 
D)  Polyplacophora. 
E)  Scaphopoda.

Question 17

____ are sea stars that have greatly affected coral reefs in the past by their feeding habits.

Accepted Answer

A)  Crown of thorns 
B)  Purple sea urchin 
C)  Red sea urchin 
D)  Serpent stars 
E)  Sea lilies 
A)  Crown of thorns 
B)  Purple sea urchin 
C)  Red sea urchin 
D)  Serpent stars 
E)  Sea lilies

Question 18

An ancient class of echinoderms whose members are suspension feeders with long, feathery arms is called:

Accepted Answer

A)  Asteroidea. 
B)  Crinoidea. 
C)  Ophiuroidea. 
D)  Echinoidea. 
E)  Holothuroidea. 
A)  Asteroidea. 
B)  Crinoidea. 
C)  Ophiuroidea. 
D)  Echinoidea. 
E)  Holothuroidea.

Question 19

Intertidal chitons and snails use the ____ as a means of attachment to the rocks.

Accepted Answer

A)  foot 
B)  mantle 
C)  visceral mass 
D)  head 
E)  radula 
A)  foot 
B)  mantle 
C)  visceral mass 
D)  head 
E)  radula

Question 20

Discuss 3 reasons why the crustaceans are considered the most important group of arthropods in the marine environment.

Accepted Answer

The crustaceans have the most numerous s

Contrast the various functions of the mantle between Cephalopods and Gastropods.

Most intertidal chitons are considered

The process by which sea cucumbers protect themselves from predators by releasing their internal organs is called:

Match the words with the most closely associated organism. -Brittle stars

A toothed, biting structure found in the mouths of sea urchins that is used for rasping algae is called:

What ecological roles do burrowing polychaetes play in the marine environment?

Unlike other decapods, hermit crabs are covered by a very thin and light exoskeleton that does not confer much protection against predators. How is this a selective advantage for the hermit crabs?

The tentacles of squids bear hooks, while those of octopus do not.

Match the molluscan class with its most closely associated characteristic. -Cephalopod

The nephridium of molluscs is part of the:

Match the molluscan shell layer with its relative position. -Periostracum

Molluscs with a tubular shell and sheath foot are:

What features of cephalopods have allowed some species to grow to large sizes relative to gastropods?

Even though echinoderms are considered advanced invertebrates, they are radially symmetric in a way similar to the simple cnidarians. What advantage does radial symmetry confer upon echinoderms?

Match the molluscan class with its most closely associated characteristic. -Polyplacophora

Molluscs having two jointed valves or shells belong to the class:

____ are sea stars that have greatly affected coral reefs in the past by their feeding habits.

An ancient class of echinoderms whose members are suspension feeders with long, feathery arms is called:

Intertidal chitons and snails use the ____ as a means of attachment to the rocks.

Discuss 3 reasons why the crustaceans are considered the most important group of arthropods in the marine environment.

Science and Marine Biology

Fundamentals of Ecology

Geology of the Ocean

Water, Waves, and Tides

Biological Concepts

Marine Microbes

Multicellular Primary Producers

Lower Invertebrates

Marine Fishes

Reptiles and Birds

Marine Mammals

Intertidal Communities

Estuaries

Coral Reef Communities

Continental Shelves and Neritic Zone

The Open Sea

Life in the Oceans Depths

Harvesting the Oceans Resources

Oceans in Jeopardy

Filters

Exam 9: Higher Invertebrates

Contrast the various functions of the mantle between Cephalopods and Gastropods.

Most intertidal chitons are considered

The process by which sea cucumbers protect themselves from predators by releasing their internal organs is called:

Match the words with the most closely associated organism. -Brittle stars

A toothed, biting structure found in the mouths of sea urchins that is used for rasping algae is called:

What ecological roles do burrowing polychaetes play in the marine environment?

Unlike other decapods, hermit crabs are covered by a very thin and light exoskeleton that does not confer much protection against predators. How is this a selective advantage for the hermit crabs?

The tentacles of squids bear hooks, while those of octopus do not.

Match the molluscan class with its most closely associated characteristic. -Cephalopod

The nephridium of molluscs is part of the:

Match the molluscan shell layer with its relative position. -Periostracum

Molluscs with a tubular shell and sheath foot are:

What features of cephalopods have allowed some species to grow to large sizes relative to gastropods?

Even though echinoderms are considered advanced invertebrates, they are radially symmetric in a way similar to the simple cnidarians. What advantage does radial symmetry confer upon echinoderms?

Match the molluscan class with its most closely associated characteristic. -Polyplacophora

Molluscs having two jointed valves or shells belong to the class:

____ are sea stars that have greatly affected coral reefs in the past by their feeding habits.

An ancient class of echinoderms whose members are suspension feeders with long, feathery arms is called:

Intertidal chitons and snails use the ____ as a means of attachment to the rocks.

Discuss 3 reasons why the crustaceans are considered the most important group of arthropods in the marine environment.

Science and Marine Biology

Fundamentals of Ecology

Geology of the Ocean

Water, Waves, and Tides

Biological Concepts

Marine Microbes

Multicellular Primary Producers

Lower Invertebrates

Marine Fishes

Reptiles and Birds

Marine Mammals

Intertidal Communities

Estuaries

Coral Reef Communities

Continental Shelves and Neritic Zone

The Open Sea

Life in the Oceans Depths

Harvesting the Oceans Resources

Oceans in Jeopardy

Filters