Chapter 13

Question 1

All of the following are aschelminths except the

Answer 1

Nemerteans

Question 2

The major unifying aschelminth feature is the

Answer 2

pseudocoelom

Question 3

Which of the following is not a common aschelminth feature?

Answer 3

incomplete digestive tract

Question 4

When aschelminths shed their cuticle, this is called

Answer 4

molting.
ecdysis.
eutely.
(both a and b are correct.)

Question 5

Which of the following phyla are not pseudocoelomate?

Answer 5

Polychaeta

Question 6

Recent morphological and molecular analyses suggest that aschelminths that molt their cuticle are most closely related to

Answer 6

arthropods

Question 7

Characteristics of the phylum Rotifera include all of the following except

Answer 7

absence of protonephridia.

Question 8

There are __________ classes within the phylum Rotifera.

Answer 8

three

Question 9

Which of the following is not an external feature of a rotifer?

Answer 9

germovitellarium

Question 10

Where would you look for a kinorhynch?

Answer 10

a marine environment

Question 11

Which of the following is not a characteristic of the phylum Nematoda?

Answer 11

cuticles are not shed

Question 12

Which of the following is not true with respect to nematode reproduction?

Answer 12

Males are larger than the females.

Question 13

The scientific name of the common pinworm is

Answer 13

Enterobius vermicularis.

Question 14

The scientific name of the common pork roundworm is

Answer 14

Trichinella spiralis.

Question 15

Members of the phylum Nematomorpha are commonly called the __________ worms.

Answer 15

horsehair
Gordian
round
(both a and b are correct)

Question 16

Of the following, which is the most recently described pseudocoelomate animal phylum?

Answer 16

Loricifera

Question 17

Which of the following is a distinct feature that occurs in all pseudocoelomate phyla?

Answer 17

pseudocoelom

Question 18

Which phyla of aschelminths contains the greatest number of described species?

Answer 18

Nematoda

Question 19

An acre of of fertile garden soil can contain up to 5 billion animals from this phyla.

Answer 19

Nematoda

Question 20

The aschelminths are seven phyla grouped only for convenience.

Answer 20

True

Question 21

The aschelminths contain organs for gas exchange and circulation.

Answer 21

False

Question 22

The majority of rotifers inhabit freshwaters.

Answer 22

True

Question 23

Mictic eggs are diploid.

Answer 23

False

Question 24

Nematodes live in both aquatic and terrestrial environments.

Answer 24

True

Question 25

Acanthocephalans are also known as spiny-headed worms because of their spiny proboscis.

Answer 25

True

Question 26

A mosquito is necessary for development of Trichinella spiralis.

Answer 26

False

Question 27

Elephantiasis is caused by filarial worms (i.e., Wuchereria spp.).

Answer 27

True

Question 28

Ascaris lumbricoides is commonly known as the giant intestinal roundworm of humans.

Answer 28

True

Question 29

All juvenile nematomorpha are parasites of arthropods.

Answer 29

True