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30 questions
Cnidarians have what type of symmetry?
Asymmetry
Radial
Bilateral
No symmetry
What are the two body forms of a cnidarian?
polyp and medusa
medusa and sessile
polyp and sessile
medusa and radial
What is the "hollow gut" of a cnidarian?
polyp
gastrovascular cavity
mesoglea
cnidocyte
How do cnidarians reproduce?
only sexually
only asexually
both sexually and asexually
genetically reproduced in labs
True or False: All cnidarians are sessile.
True
False
What body type does this cnidarian posses?
Polyp
Medusa
What is the free-swimming form of Cnidarians?
polyp
medusa
planula
What are the stinging cells inside the cnidocyte that inject paralyzing toxins into their prey?
pinacocytes
lysomatocyts
choanocytes
nematocysts
Cnidarians include all of the following EXCEPT:
Anemones
Jellyfish
Sea slugs
Hydras
Sessile, tube shaped body form of cnidarians such as corals and hydra.
Polyp
Medusa
Free swimming, umbrella shaped body with tentacles that hang down.
Polyp
Medusa
The cnidarian body wall consists of all but which of these?
epidermis
mesoglea
medusa
gastroderm
Based on their diet, cnidarians are _____.
herbivores
omnivores
carnivores
photosynthetic
Surrounds the mouth and helps pull in food
Tentacles
Gastrovascular cavity
Polyp
Planula
True or False:
Fish, shrimp, and other small animals live among the tentacles of large sea anemones.
True
False
Coral reefs protect the land from ________.
sharks
erosion
jellyfish
tsunamis
_____________ provide shelter for thousands of species of marine life.
Hydras
Jellyfish
Piers
Corals
Which of these cnidarians are the most ecologically important?
jellyfish and corals
corals and anemones
hydra and anemones
none of the above
When medusae mature, they reproduce _______ by releasing gametes into the water.
sexually
asexually
both of these
neither of these
True or False:
Cnidarians lack muscle cells that most other animals use to move about.
True
False
Cnidarians have ______ body openings.
three
two
one
no
What happens when an animal touches a nematocyst?
nothing
the dart uncoils and buries itself into the skin of the animal; the cnidarian then dies (similar to a honey bee when it stings)
the dart uncoils and buries itself into the skin of the animal; the unlucky animal is paralyzed or killed then eaten.
the nematocyst triggers the tentacles to elongate and constrict around the animal like snakes
Layer of cells that covers the outer surface of the cnidarian's body:
gastroderm
mesoglea
endoderm
epidermis
Located between the epidermis and the gastroderm:
mesoglea
tentacles
nematocysts
polyps
True or False:
Cnidarians are soft-bodied animals with stinging tentacles arranged in circles around their mouths.
True
False
True or False:
All cnidarians live in groups of dozens or even hundreds of individuals.
True
False
True or False:
Hydra are found mostly in freshwater.
True
False
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