Chapter 13 Flashcards
All of the following are aschelminths except the
Nemerteans
The major unifying aschelminth feature is the
pseudocoelom
Which of the following is not a common aschelminth feature?
incomplete digestive tract
When aschelminths shed their cuticle, this is called
molting.
ecdysis.
eutely.
(both a and b are correct.)
Which of the following phyla are not pseudocoelomate?
Polychaeta
Recent morphological and molecular analyses suggest that aschelminths that molt their cuticle are most closely related to
arthropods
Characteristics of the phylum Rotifera include all of the following except
absence of protonephridia.
There are __________ classes within the phylum Rotifera.
three
Which of the following is not an external feature of a rotifer?
germovitellarium
Where would you look for a kinorhynch?
a marine environment
Which of the following is not a characteristic of the phylum Nematoda?
cuticles are not shed
Which of the following is not true with respect to nematode reproduction?
Males are larger than the females.
The scientific name of the common pinworm is
Enterobius vermicularis.
The scientific name of the common pork roundworm is
Trichinella spiralis.
Members of the phylum Nematomorpha are commonly called the __________ worms.
horsehair
Gordian
round
(both a and b are correct)
Of the following, which is the most recently described pseudocoelomate animal phylum?
Loricifera
Which of the following is a distinct feature that occurs in all pseudocoelomate phyla?
pseudocoelom
Which phyla of aschelminths contains the greatest number of described species?
Nematoda
An acre of of fertile garden soil can contain up to 5 billion animals from this phyla.
Nematoda
The aschelminths are seven phyla grouped only for convenience.
True
The aschelminths contain organs for gas exchange and circulation.
False
The majority of rotifers inhabit freshwaters.
True
Mictic eggs are diploid.
False
Nematodes live in both aquatic and terrestrial environments.
True
