Phylum Cnidaria

All of the following animals are in the phylum Cnidaria EXCEPT:

• Jellyfish

• Octopus

• Sea Anemones

• Coral reefs

To protect themselves, some cnidaria have

• stinging cells

• poison sacs

• stabbing points

• biting teeth

Animals in the phylum Cnidaria are found in

• desert habitats

• forest habitats

• aquatic habitats

• all habitats

Jellyfish differ from sea anemones in that

• only one has stinging cells

• only one has tentacles

• only one uses the same opening for food and waste

• only one has a mouth that faces downward

The bell-shaped Cnidaria include (adult)

• jellyfish

• sea anemones

• coral

• hydras

Which body form of cnidarians are free swimming?

• Polyp

• Medusa

• Endoderm

• Ectoderm

Which body form of cnidarians are sessile?

• Polyp

• Medusa

• Endoderm

• Ectoderm

Which of the following is not a layer in cnidarians?

• Ectoderm

• Mesoglea

• Endoderm

• Ganglion

The free-floating cnidaria (not attached to the sea floor) is the

• jellyfish

• sea anemones

• coral reefs

• hydra

Classify the following as a polyp form or medusa form: Reef-building corals on the Great Barrier Reef.

• Polyp

• Medusa