Practice Questions for Phylum Cnidaria and Phylum Ctenophora

Phylum Cnidaria

1. Cnidarians have specialized cells called __________ that may contain a stinging organelle called the __________.
2. T/F - Cnidarians are diploblastic having both an ectoderm and a mesoderm.
3. Do Cnidarians have a gut? If yes, is it complete or incomplete?
4. Cnidarians have a gelatinous layer called __________, that may aid in buoyancy for free swimming forms.
5. Do Cnidarians have extracellular or intracellular digestion?
6. Cnidarians have a ___________ _______ system instead of a central __________ system.
7. T/F - Cnidarians are mostly filter feeders with only a few predatory species
8. The primitive eye of Cnidarians is called a(n) _____________.
9. A nerve net is _____________, while a central nervous system is ___________.
10. T/F - Cnidarians have both longitudinal and circular muscles.
11. What type of symmetry do Cnidarians exhibit?
12. Cnidarians exhibit dimorphism: the __________ stage is free-swimming and the ___________ stage is sessile.
13. T/F - Dimorphism decreases the ecological niche potential
14. Cnidarians have a __________ gut.
15. The free-swimming larvae of Cnidaria is a ____________.
16. T/F - Cnidarians can only reproduce sexually.
17. Which two systems do Cnidarians lack?
18. T/F - Cnidarians are pseudocoelomates.
19. I am a marine dwelling medusa with no velum, I belong to class ___________.
20. I am a freshwater species with no medusa stage, I belong to class ____________.
21. I am a marine dwelling polyp that forms a mutualistic relationship with algae, I belong to class ____________.
22. I am a a stalked jellyfish, I belong to class ____________.
23. My common name is box jellyfish and have a velarium and 4 long tentacles, I belong to class ____________.
24. In the polymorphism of obelia the ___________ stage exhibits sexual reproduction and the ____________ stage exhibits asexual reproduction.
25. T/F - Obelia have a velum and Moon Jellyfish lack a velum.
26. This member of Hydrazoa lives in colonies of polyps and medusae and is extremely dangerous.
27. T/F - Anthozoans have lost their medusa stage.
28. Coral reefs are restricted by what environmental factors?
29. Algae blooms, caused by over nutrification, lead to _________________ that have very little oxyen available and almost no life.

Phylum Ctenophora

1. What are the common names for Ctenophorans?
2. T/F - Ctenophorans are triploblastic organisms with spherical symmetry.
3. The gelatinous layer within Ctenophorans is ______________.
4. The ____________ cells are adhesive and aid in capturing prey.
5. T/F - Ctenophorans exhibit polymorphism body stages and have several colonial forms.
6. Do Ctenophorans have a true coelomic cavity?