1. What do phylum Porifera (sponges) and phylum Placozoa have in common?
- Both contain animals that don't have tissue.
- Both have animals with only four cell types.
- Both contain a majority of animals with radial symmetry.
- Both contain animals with asymmetrical body plans.
Animals in both phyla have irregularly shaped body plans.
Animals in both phyla have irregularly shaped body plans.
Animals in both phyla have irregularly shaped body plans.
Animals in both phyla have irregularly shaped body plans.
2. Which of the following phyla contains a majority of animals that eat by means of phagocytosis?
- Placozoa
- Porifera
- Cnidaria
- Annelida
The placozoans eat by means of phagocytosis.
The placozoans eat by means of phagocytosis.
The placozoans eat by means of phagocytosis.
The placozoans eat by means of phagocytosis.
3. Which of the following cells within Trichoplax adhaerens is most involved in digestion?
- fiber cells
- cylinder cells
- gland cells
- cover cells
Gland cells secrete digestive enzymes to help digest food particles.
Gland cells secrete digestive enzymes to help digest food particles.
Gland cells secrete digestive enzymes to help digest food particles.
Gland cells secrete digestive enzymes to help digest food particles.
4. Which of the following cells within Trichoplax adhaerens are thought to play a major role in the animal's movement?
- fiber cells
- cylinder cells
- gland cells
- cover cells
Fiber cells play a major role in allowing the animal to change its body shape, thus aiding it in gliding along surfaces.
Fiber cells play a major role in allowing the animal to change its body shape, thus aiding it in gliding along surfaces.
Fiber cells play a major role in allowing the animal to change its body shape, thus aiding it in gliding along surfaces.
Fiber cells play a major role in allowing the animal to change its body shape, thus aiding it in gliding along surfaces.
5. Which of the following animals belongs in the phylum Placozoa?
- Daphnia
- Trichoplax adhaerens
- sponges
- sea anemones
T. adhaerens is the only known animal to be classified in phylum Placozoa.
T. adhaerens is the only known animal to be classified in phylum Placozoa.
T. adhaerens is the only known animal to be classified in phylum Placozoa.
T. adhaerens is the only known animal to be classified in phylum Placozoa.
6. Where are the fiber cells located within Trichoplax adhaerens?
- inside the ectoderm layer on the dorsal surface
- inside the endoderm layer on the ventral surface
- in between the endoderm and ectoderm layers
- sandwiched in between the gland cells on the ventral surface
The fiber cells make up the meshwork in the middle of the animal, situated between the dorsal and ventral sides, or in between the ectoderm and endoderm layers.
The fiber cells make up the meshwork in the middle of the animal, situated between the dorsal and ventral sides, or in between the ectoderm and endoderm layers.
The fiber cells make up the meshwork in the middle of the animal, situated between the dorsal and ventral sides, or in between the ectoderm and endoderm layers.
The fiber cells make up the meshwork in the middle of the animal, situated between the dorsal and ventral sides, or in between the ectoderm and endoderm layers.
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