21.
Generally, members of which flatworm class(es) are nonparasitic?
A
Turbellaria
B
Trematoda
C
Cestoda
D
Monogenea
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Generally, members of which flatworm class(es) are nonparasitic?
Turbellaria
Trematoda
Cestoda
Monogenea
Which characteristic is shared by both cnidarians and flatworms?
dorsoventrally flattened bodies
flame bulbs
radial symmetry
a digestive system with a single opening
Corals are most closely related to which group?
jellies
freshwater hydras
sea anemones
sponges
Which class of the phylum Cnidaria includes?jellies?with rounded (as opposed to box like medusae?)
Hydrozoa
Scyphozoa
Anthozoa
Cubozoa
The members of which class of the phylum Cnidaria occur only as polyps?
Hydrozoa
Scyphozoa
Anthozoa
Cubozoa
Which of the following is true of members of the phylum Cnidaria?
They are not capable of locomotion because they lack true muscle tissue.
They are primarily filter feeders.
They have either or both of two body forms: mobile polyps and sessile medusae.
They may use a gastrovascular cavity as a hydrostatic skeleton.
Which of the following are characteristics of the phylum Cnidaria?1. a gastrovascular cavity2. a polyp stage3. a medusa stage4. cnidocytes5. a pseudocoelom
1 and 4
2 and 3
2, 3, and 4
1, 2, 3, and 4
A radially symmetrical animal that has two embryonic tissue layers probably belongs to which phylum?
Porifera
Cnidaria
Platyhelminthes
Nematoda
In terms of food capture, which sponge cell is most similar to the cnidocyte of a Cnidarian?
zygote
choanocyte
gamete
epidermal cell
Which chemical is synthesized by some sponges and acts as an antibiotic?
streptomycin
spongin
calcium carbonate
cribrostatin
Which of these can be observed in the mesohyl of various undisturbed sponges at one time or another?1. amoebocytes2. spicules3. spongin4. zygotes5. choanocytes
1 only
1 and 2
1, 2, and 3
1, 2, 3, and 4
A sponges structural materials (spicules, spongin) are manufactured by the
pore cells.
epidermal cells.
choanocytes.
amoebocytes.
Which of the following is correctly associated with sponges?
osculum
body cavity
cnidocytes
spicules made of chitin
Which cells in a sponge are primarily responsible for trapping and removing food particles from circulating water?
choanocytes
mesoglea cells
pore cells (porocytes)
epidermal cells