Download Document

AQ 2015-2016 BIO 193 SI WEEK 7.2
Which characteristic(s) is (are) shared by both cnidarians and flatworms?
A) dorsoventrally flattened bodies
B) true muscle
C) radial symmetry
D) a digestive system with a single opening
E) two of these
How many of the following are characteristics of at least some members of the phylum
Cnidaria?
1. a gastrovascular cavity
2. a polyp stage
3. a medusa stage
4. cnidocytes
5. a pseudocoelom
A) one of these
B) two of these
C) three of these
D) four of these
E) five of these
The blastopore denotes the presence of an endoderm-lined cavity in the developing embryo, a
cavity that is known as the
A) archenteron.
B) blastula.
C) coelom.
D) germ layer.
E) blastocoel.
Which of the following is true of members of the phylum Cnidaria?
A) They are not capable of locomotion because they lack true muscle tissue.
B) They are primarily filter feeders.
C) They have either, or both, of two body forms: mobile polyps and sessile medusae.
D) They may use a gastrovascular cavity as a hydrostatic skeleton.
E) They are the simplest organisms with a complete alimentary canal (two openings)
AQ 2015-2016 BIO 193 SI WEEK 7.2
What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates
A) have a body cavity, whereas pseudocoelomates have a solid body.
B) contain tissues derived from mesoderm, whereas pseudocoelomates have no such tissue.
C) have a body cavity completely lined by mesodermal tissue, whereas pseudocoelomates do
not.
D) have a complete digestive system with mouth and anus, whereas pseudocoelomates have a
digestive tract with only one opening.
E) have a gut that lacks suspension within the body cavity, whereas pseudocoelomates have
mesenteries that hold the digestive system in place
The blastopore is a structure that first becomes evident during
A) fertilization.
B) gastrulation.
C) the eight-cell stage of the embryo.
D) coelom formation.
E) cleavage