Chapter 10

Question 1

acoelomates

Answer 1

triploblastic animals

Question 2

triploblatic means

Answer 2

blastula splits into three layers,

ectoderm, mesoderm, endoderm

Question 3

today’s phyla of lophotrochozoa are

Answer 3

not monophyletic!

Question 4

characteristics of

Answer 4

triploblastic
bilaterally symmetrical
acoelomoate
dorsoventrally flattened
incomplete gut
protonephridia
ganglion with longitudinal nerve cords 
monoecious

Question 5

Which of the following is not an acoelomate?

Answer 5

Rotifera

Question 6

Three important characteristics first appeared in the acoelomates. Which of the following is not one of them?

Answer 6

nervous tissues

Question 7

Acoelomates lack a body cavity because the __________ cells completely fills the area between the outer epidermis and digestive tract.

Answer 7

parenchymal

Question 8

Which of the following classes is typically not parasitic?

Answer 8

Turbellaria

Question 9

Marine ribbon worms are found within the phylum:

Answer 9

Nemertea

Question 10

Which of the following would you find either living a free-living life style or living in the space between bottom sediments in freshwater?

Answer 10

Gastrotricha

Question 11

The lone animal is this phyla lives on the mouthparts of North Atlantic lobsters.

Answer 11

Cycliophora

Question 12

With 34,000 species and counting, there are more described animals in this phyla of acoelomates than in any other phyla of acoelomates.

Answer 12

Platyhelminthes

Question 13

Animals in the phyla Platyhelminthes, Nemertea, Gastrotricha, Acoelomorpha, and Cycliophora exhibit this type of symmetry.

Answer 13

bilateral

Question 14

Sexual maturity in a larval body form is called

Answer 14

paedomorphosis

Question 15

Characteristics of the Platyhelminthes include all of the following except

Answer 15

many organ systems present.

Question 16

Most turbellarians, such as the common planarian,

Answer 16

are carnivores
will also feed as herbivores
have chemoreceptors that help them detect food
(all of the above)

Question 17

Which is not part of the protonephridial system in a turbellarian?

Answer 17

excretory tube

Question 18

A few turbellarians have a free swimming larva termed a

Answer 18

Muller’s larva.

Question 19

Monogenetic flukes are so named because they

Answer 19

have only one generation in their life cycle.

Question 20

A small group of flukes that are primarily internal parasites of molluscs are the

Answer 20

subclass Aspidogastrea.

Question 21

The scientific name of the Chinese liver fluke is:

Answer 21

Clonorchis sinensis

Question 22

The scientific name of the sheep liver fluke is:

Answer 22

Fasciola hepatica

Question 23

Almost all cestodes belong to the subclass

Answer 23

Eucestoda

Question 24

In the beef tapeworm life cycle, as an egg develops it forms a six-hooked (hexacanth) larva called an oncosphere.

Answer 24

True

Question 25

A fluid-filled bladder worm larva of a pork tapeworm is called a cysticercus, and it may form bladders in the brain of the mammalian host.

Answer 25

True

Question 26

The most distinctive feature of nemerteans is a long proboscis held in a sheath called a rhynchocoel.

Answer 26

True

Question 27

Nemerteans are microscopic, aquatic animals with a complete digestive tract and an unusual proboscis.

Answer 27

False

Question 28

Animals in the phyla Acoelomorpha are small flat worms less than 5 mm in length.

Answer 28

True

Question 29

Animals in the phyla Platyhelminthes have diploblastic tissue organization.

Answer 29

False

Question 30

The monogenetic flukes (class Monogenea) are mostly external parasites of fishes.

Answer 30

True

Question 31

Turbellarians are monoecious with reproductive systems adapted for internal fertilization.

Answer 31

True

Question 32

Most turbellarians move entirely by cilia and are predators and scavengers.

Answer 32

True