Poriferan & Cnidarian Review

Which includes ONLY members of the phylum Cnidaria?

• Hydra, jellies, coral, clams

• Sea anemones, jellies, corals, hydra

• Jellies, squid, corals, snails

• Corals, hydra, jellies, sea slugs

Medusa and polyp are the two main body plans for Cnidarians.

• True

• False

The stinging cells found in the tentacles of Cnidarians are called

• Nematocysts

• Radular teeth

• Cilia

• Rhopalia

How do jellies use rhopalia?

• Rhopalia help jellies take in water for their water skeleton.

• Rhopalia allow jellies to digest food they catch.

• Rhopalia help jellies concentrate oxygen gas from the water.

• Rhopalia help jellies sense conditions and organisms around them.

Corals are plants.

• True

• False

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Why do corals and zooxanthellae need each other?

• The algae give the coral energy to build their skeletons.

• The coral give the dinoflagellates safety.

• The waste products of the coral are used by the symbiont microorganisms for photosynthesis. 

• All of these

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Why are corals ONLY found in clear, shallow water?

• Light doesn’t penetrate deep water.

• Light doesn’t penetrate water with a lot of sediment.

• Zooxanthellae in corals need light for photosynthesis.

• All of these.

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How are colonial corals able to share nutrients?

• They float the nutrients in the water to one another.

• They pass the nutrients through their coenosarcs.

• The nutrients pass through the zooxanthellae.

• The nutrients pass on mucus nets.

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What role do jellies play in the ecosystem?

• A 

  They are predators and prey in the food chain.

• B 

  They are filter feeders and clean the water of toxins.

• C 

  They provide protection and shelter for some fish species.

• A & C

  only

• All of these

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How do sea anemones reproduce?

• Spawning

• Budding

• Binary fission

• All of these

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