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The Cnidarians

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The Cnidarians Answer Key

1. 
What are the two main body forms that exist in the phylum Cnidaria?
  1. polyp and medusa
  2. planula and veliger
  3. adult and larvae
  4. trocophore and megalope
2. 
Which specific structures do cnidarians use for paralyzing their prey?
  1. cnidocils
  2. cnidocytes
  3. nematocysts
  4. ocelli
3. 
A jellyfish can sting even if it has been dead for several days.
  1. True
  2. False
4. 
Which group of cnidarians has a polyp stage that is most prominent?
  1. class Hydrozoa
  2. class Scyphozoa
  3. class Anthozoa
  4. class Cubozoa
5. 
Which group of cnidarians contains animals that are considered some of the most deadly in the ocean?
  1. class Hydrozoa
  2. class Cubozoa
  3. class Anthozoa
  4. class Scyphozoa
6. 
What is the jelly-like material that is found inside the bell of a jellyfish and gives it its structure?
  1. mesoglea
  2. cytoplasm
  3. ocelli
  4. cnidocil
7. 
What is the function of the ocelli found on the perimeter of a medusa's bell?
  1. The ocelli are where gametes are produced.
  2. The ocelli are able to detect changes in water pressure.
  3. The ocelli can detect different intensities of light.
  4. The ocelli can be used to trigger the cnidocytes to fire when prey approaches.
8. 
Which statement is the method by which cnidarians are able to digest their food?
  1. Cnidarians have a complete digestive system with two openings.
  2. Cnidarians absorb their food across their body wall into a primitive gut cavity.
  3. Cnidarians use their tentacles to break down the captured prey before it is taken into the body through the mouth.
  4. Cnidarians only have one opening for digestion, located on the aboral side of the animal.
9. 
Cnidarians have radial because they can be divided along a central axis from top to bottom.
10. 
What is the symbiotic relationship that exists between corals and algae?
  • Corals are unable to move so they rely on symbiotic algae living within their tissues to provide food for them. The algae are called zooxanthellae and the photosynthesis they undergo provides nutrients for the corals. In return, the algae get a safe place to live. WHen zooxanthellae die the corals are unable to survive, so they tend to bleach.
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