Question 1

Which of the following about mollusks is false?

Accepted Answer

A)  The body plan includes a foot, visceral mass, and mantle. 
B)  The ancestor of modern mollusks was likely an unsegmented, worm-like animal. 
C)  The foot may have different functions in different species. 
D)  The visceral mass secretes the shell that is typical of many mollusks. 
E)  Monoplacophorans were the most abundant mollusks during the Cambrian period.

Question 2

Refer to the figure.  This animals shown are

Accepted Answer

A)  marine annelids. 
B)  marine crustaceans. 
C)  freshwater mollusks. 
D)  marine mollusks. 
E)  freshwater annelids.

Question 3

In holometabolous insects,

Accepted Answer

A)  adults cannot fold their wings against their bodies. 
B)  juveniles resemble small adults. 
C)  all forms are secondarily wingless. 
D)  a larval stage is typically followed by a pupal stage. 
E)  all forms have one pair of wings.

Question 4

The large and remarkable pogonophoran annelids live near deep ocean hydrothermal (volcanic) vents where food items are scarce.How do pogonophorans, which have completely lost their digestive tracts, obtain most of their nutrition?

Accepted Answer

A)  They are able to conduct photosynthesis. 
B)  Their tissues harbor endosymbiotic bacteria that fix carbon by oxidizing hydrogen sulfide and methane. 
C)  They fix carbon from minerals found in mud on the ocean floor. 
D)  They filter algae from ocean water. 
E)  They feed on fish that become entangled in their tentacles.

Question 5

Which of the following has no more than three pairs of legs?

Accepted Answer

A)  Crustaceans 
B)  Centipedes 
C)  Isopods 
D)  Hexapods 
E)  Myriapods

Question 6

One group of pogonophorans, a polychaete clade, lives thousands of meters below the ocean surface near deep-sea hydrothermal vents.Which of the following is least likely to be functionally related to these facts?

Accepted Answer

A)  They live near hydrothermal vents that produce sulfide-rich waters. 
B)  They occur in high densities. 
C)  They are related to annelids. 
D)  They form symbioses with photosynthetic protists. 
E)  They lack a digestive tract.

Question 7

An animal with bilateral symmetry, a pseudocoelom, a tubular digestive system, and a multilayered cuticle is most likely a(n)

Accepted Answer

A)  arrow worm. 
B)  nematode. 
C)  flatworm. 
D)  polychaete. 
E)  annelid.

Question 8

_______ have unjointed legs and a soft segmented body.

Accepted Answer

A)  Onychophorans 
B)  Nudibranchs 
C)  Annelids 
D)  Arthropods 
E)  Nematodes

Question 9

Refer to the figure.  Based on the figure and what you know about arthropods, what feature(s) distinguish insects from all other arthropod groups?

Accepted Answer

A)  Thoracic regions that have no appendages 
B)  Bodies divided into two regions 
C)  Paired set(s) of wings 
D)  Mandibles 
E)  A ventral nerve cord

Question 10

Wings are lacking in which group?

Accepted Answer

A)  Beetles 
B)  Spiders 
C)  Flies 
D)  Mosquitoes 
E)  Grasshoppers

Question 11

If a person orders calamari (squid) at a restaurant, the mollusks they have ordered are _______.

Accepted Answer

The answer of If a person orders calamari (squid) at...

Question 12

A thickened, strong, flexible, waterproof body covering made of a polysaccharide called _______ was characteristic of the Precambrian ecdysozoan lineage leading to arthropods.

Accepted Answer

The answer of A thickened, strong, flexible, waterproof body covering...

Question 13

Many lophotrochozoans have a type of free-living larva called a(n) _______.

Accepted Answer

The answer of Many lophotrochozoans have a type of free-living...

Question 14

A "blood chamber," in which fluid from an open circulatory system bathes the internal organs before returning to blood vessels,

Accepted Answer

A)  is a called a hemocoel. 
B)  describes a closed circulatory system. 
C)  occurs in annelids 
D)  occurs in acoelomate animals. 
E)  is made up of segments.

Question 15

In a mollusk, the _______ secretes the shell?

Accepted Answer

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

Question 16

The _______ of ribbon worms may be a modification of the lophophore.

Accepted Answer

The answer of The _______ of ribbon worms may be...

Question 17

With respect to obtaining nutrition, hemoglobin in the tentacles of pogonophorans is an important part of the _______ with bacteria.

Accepted Answer

The answer of With respect to obtaining nutrition, hemoglobin in...

Question 18

Which of the following has a pseudocoel?

Accepted Answer

A)  Phoronids 
B)  Horsehair worms 
C)  Brachiopods 
D)  Chelicerates 
E)  Hexapods

Question 19

Which statement about oligochaetes is false?

Accepted Answer

A)  They are hermaphroditic. 
B)  They have separate nerve centers called ganglia. 
C)  They have a segmented coelom. 
D)  They have serially repeated organs. 
E)  Their zygotes undergo radial cleavage.

Question 20

Some mollusks have a rasping feeding structure known as the

Accepted Answer

A)  proboscis. 
B)  rhynchocoel. 
C)  corona. 
D)  radula. 
E)  mastax.

Exam 31: Protostome Animals