Name (9 pts) Match the words to their descriptions

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Porifera, Cnidaria, Ctenophora


(9 pts) Match the words to their descriptions

  1. _F_Statocyst a. No movement throughout an organisms lifetime

  2. _H_Choanocyte b. Cells that conduct signals in all directions

  3. _D_Mesohyl c. The “spiky” part of the sponge skeletal structure

  4. _B_Nerve Net d. The connective tissue in Sponges

  5. _G_Cnidocyte e. An organism with both male and female reproductive

  6. _J_Embryo parts

  7. _C_Spicule f. A sense organ found in Cnidaria and Ctenophora

  8. _A_Sessile g. A specialized cells that “stings” when touched.

  9. _E_Hermaphrodite h. Cells in sponges that help move water through the


J An undeveloped young organism

(10 pts) Fill in the blank

  1. Sponges belong to kingdom Anamalia and phylum Porifera

  2. An Incomplete Gut is when the mouth and the anus are the same opening.

  3. The two long extensions of Ctenophora are called Tentacles

  4. Cnidaria have Radial symmetry.

  5. Organs that produce reproductive cells are called gonads.

  6. Jelly fish are in the phyla Cnidaria.

  7. Comb jellies have eight comb plates around their body.

Label the following pictures with the correct canal system name.

Leuconoid Asconoid Syconoid

(10 pts) Multiple Guess

  1. What is an example of porifera?

    1. Jelly Fish c. Man-of-War

    2. Sponges d. Comb Jellies

  2. What are colloblasts?

    1. Sticky cells on tentacles that help the animal eat. c. Filter-feeders

    2. How the organism regenerates itself d. the inside layer of cnidarian

  3. What phyla are comb jellies in?

    1. Porifera c. Cnidaria

    2. Protozoa d. Ctenophora

  1. What type of nervous system does Ctenophora have?

    1. Ocelli c. None

    2. Nerve net d. Cephalization

  2. Which phyla has a polyp and a medusa form?

    1. Porifera c. Cnidaria

    2. Protozoa d. Ctenohora

  3. Which phyla’s name means “pore-bearing”?

    1. Porifera c. Cnidaria

    2. Protozoa d. Ctenophora

  4. What is the sense organ that reacts to (senses) light?

    1. Statocyst c. Ocelli

    2. Nerve net d. None of the above

  5. What kind of reproduction does Cnidaria have?

    1. Sexual only c. Asexual only

    2. Sexual and Asexual d. Budding

  6. What type of symmetry do sponges have?

    1. Radial c. Bilateral

    2. Biradial d. Asymmetrical

  7. Which phyla live commensally with other animals?

    1. Porifera c. Cnidaria

    2. Ctenophora d. Your mom

Short answer. Choose 3 questions (27 to 32) and answer them on the paper provided. Indicate which the question number next to your answer. Each answer should be at least 3 or 4 sentences long. If you need more room please ask for more paper.

  1. (2pts) Describe IN DETAIL the difference between a complete gut and an incomplete gut.

1 pt. for definition of complete gut

1 pt. for definition of incomplete gut.

  1. (2pts) Explain how and what sponges eat.

1 pt. filter feeding

1pt. anything that is the right size

  1. (2pts) What are two things all three phyla (porifera, cnidarian, and ctenophore) have in common?

1 pt. for each correct aswer.

  1. (2pts) Describe IN DETAIL how statocyst works. You may draw pictures to help with your answer.

1 pt. Structure

1 pt Function

  1. (3pts) Describe how a nematocyst works. Include a picture.

1 pt. Structure

1 pt. Fnction

  1. (2pts) What is unique about sea anenomes?

They have no medusa form, their muscles allow them to “swim”, their relationship with clown fish.

1pt for each correct answer.

And as always….

  1. (4 points) Write a short answer question about the information that you studied for this test that was not asked. The question must be relevant to Phyla Porifera, Cnidaria and Ctenophora. Provide both the question and the answer. The answer should be about 2 to 4 sentences long.

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