ZOOL 250 - Lab Final Exam Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: Phylum Ctenophora
Answer:
Comb jellies
Can retract tentacles to capture prey
Diploblastic, but they exhibit bi-radial rather than fully radial symmetry
Tentacle lined with sticky colloblast cells
Bioluminescent
Not highly motile
Q: Phylum Rotifera
Answer:
- small -> could be confused with protozoans
Q: Gastric pouches
Answer:
Involved in the initial stages of digestion, where food is broken down into smaller
particles
Q: Radial canal
Answer:
part of the gastrovascular system, extending outward from the stomach and
connecting to a ring canal
Q: Rhopalia
Answer:
Contain a concentration of neurons, chemosensory pits, statocysts, and often ocelli,
playing a crucial role in their sensory and navigational abilities
Q: Statolith
, Answer:
Dense mass of living cells (lithocytes) within the statocyst, a sensory organ at the
aboral pole, that helps the animal orient itself to gravity by controlling the beat
frequencies of the ciliary comb row
Q: Comb rows
Answer:
eight rows of fused cilia for locomotion
Q: Parapodia
Answer:
paired, unjointed lateral appendages found in polychaete worms, often fleshy and
used for locomotion, respiration, and other functions
Q: Acicula
Answer:
fleshy, paddle-like appendages used for locomotion
Q: Setae
Answer:
stiff, hair-like, or bristle-like structures found on the bodies of many organisms,
especially invertebrates, often used for sensory or locomotor functions (modified
for support in Nereis sp. parapodia)
Q: Prostomium
Answer:
the unsegmented, preoral (before the mouth) portion of the head in certain annelid
worms, like earthworms, often resembling a lip or shelf-like extension over the
dorsal side of the mouth
Q: Clitellum
Answer:
a raised band encircling the body of oligochaete worms and some leeches, made up
of reproductive segments
Q: Metanephridia
Solutions | Latest 2026 Update
Q: Phylum Ctenophora
Answer:
Comb jellies
Can retract tentacles to capture prey
Diploblastic, but they exhibit bi-radial rather than fully radial symmetry
Tentacle lined with sticky colloblast cells
Bioluminescent
Not highly motile
Q: Phylum Rotifera
Answer:
- small -> could be confused with protozoans
Q: Gastric pouches
Answer:
Involved in the initial stages of digestion, where food is broken down into smaller
particles
Q: Radial canal
Answer:
part of the gastrovascular system, extending outward from the stomach and
connecting to a ring canal
Q: Rhopalia
Answer:
Contain a concentration of neurons, chemosensory pits, statocysts, and often ocelli,
playing a crucial role in their sensory and navigational abilities
Q: Statolith
, Answer:
Dense mass of living cells (lithocytes) within the statocyst, a sensory organ at the
aboral pole, that helps the animal orient itself to gravity by controlling the beat
frequencies of the ciliary comb row
Q: Comb rows
Answer:
eight rows of fused cilia for locomotion
Q: Parapodia
Answer:
paired, unjointed lateral appendages found in polychaete worms, often fleshy and
used for locomotion, respiration, and other functions
Q: Acicula
Answer:
fleshy, paddle-like appendages used for locomotion
Q: Setae
Answer:
stiff, hair-like, or bristle-like structures found on the bodies of many organisms,
especially invertebrates, often used for sensory or locomotor functions (modified
for support in Nereis sp. parapodia)
Q: Prostomium
Answer:
the unsegmented, preoral (before the mouth) portion of the head in certain annelid
worms, like earthworms, often resembling a lip or shelf-like extension over the
dorsal side of the mouth
Q: Clitellum
Answer:
a raised band encircling the body of oligochaete worms and some leeches, made up
of reproductive segments
Q: Metanephridia
