ZOOL 250 Final Exam Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: Aschelminthes
Answer:
Common Characteristics - • Pseudocoelom (false body cavity)
Distinct body cavity, but lacks peritoneal linings and membranes (mesenteries)
Pseudocoelom often fluid-filled
Serves in circulation, digestion, and locomotion (hydrostatic skeleton)
Q: Phylum Chaetognatha
Answer:
lec 12
nektonic -
transitional phylum -
Q: Clade Gnathifera
Answer:
Chaetognatha becuase of mouth piece
rotifera -
Q: rotifers and acanthocephalans have been considered closely related
Answer:
dense epi layer
Non-acanthocephalan Rotifera... -
lorica -
eutely -
mastax -
trophi -
protonephridia -
cyclic parthenogenesis -
Q: amictic females
Answer:
reproduce by diploid parthenogenesis. Their eggs develop into daughters.
, Q: mictic females
Answer:
Haploid eggs which turn into males in unstable times
Q: sexually produced eggs stay dormant until environment is good again
Answer:
amictic females
Q: anhydrobiosis
Answer:
rofters and tardigarada
Q: Seisonidea
Answer:
ectoparastic
Q: Rotifera: Acanthocephala
Answer:
endoparastic, larval stages, Polymorphus
Q: are famous for manipulation of intermediate hosts
Answer:
Rotifera: Acanthocephala
clade Ecdysozoa -
determinate cleavage and eutely -
entomopathogenic nematodes -
gut is highly reduced or absent in the adults, which do not feed -
somehow induce host to move to water -
large, spiny, eversible head end called an 'introvert' -
Q: deuterostome-style development
Answer:
penis worms
Q: trochophore larva
Solutions | Latest 2026 Update
Q: Aschelminthes
Answer:
Common Characteristics - • Pseudocoelom (false body cavity)
Distinct body cavity, but lacks peritoneal linings and membranes (mesenteries)
Pseudocoelom often fluid-filled
Serves in circulation, digestion, and locomotion (hydrostatic skeleton)
Q: Phylum Chaetognatha
Answer:
lec 12
nektonic -
transitional phylum -
Q: Clade Gnathifera
Answer:
Chaetognatha becuase of mouth piece
rotifera -
Q: rotifers and acanthocephalans have been considered closely related
Answer:
dense epi layer
Non-acanthocephalan Rotifera... -
lorica -
eutely -
mastax -
trophi -
protonephridia -
cyclic parthenogenesis -
Q: amictic females
Answer:
reproduce by diploid parthenogenesis. Their eggs develop into daughters.
, Q: mictic females
Answer:
Haploid eggs which turn into males in unstable times
Q: sexually produced eggs stay dormant until environment is good again
Answer:
amictic females
Q: anhydrobiosis
Answer:
rofters and tardigarada
Q: Seisonidea
Answer:
ectoparastic
Q: Rotifera: Acanthocephala
Answer:
endoparastic, larval stages, Polymorphus
Q: are famous for manipulation of intermediate hosts
Answer:
Rotifera: Acanthocephala
clade Ecdysozoa -
determinate cleavage and eutely -
entomopathogenic nematodes -
gut is highly reduced or absent in the adults, which do not feed -
somehow induce host to move to water -
large, spiny, eversible head end called an 'introvert' -
Q: deuterostome-style development
Answer:
penis worms
Q: trochophore larva
