Phylum Cnidaria Body Symmetry Quiz

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Quizzes Created: 4 | Total Attempts: 11,494
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Learn more about phylum cnidaria by taking this interesting and knowledgeable quiz. All the best


Questions and Answers
  • 1. 

    Which of the following characteristics do CNIDARIANS exhibit?

    • A.

      Radial symmetry

    • B.

      Stinging cells

    • C.

      Tentacled

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    CNIDARIANS exhibit all of the above characteristics. They have radial symmetry, meaning their body parts are arranged around a central axis. They also possess stinging cells called cnidocytes, which they use for defense and capturing prey. Additionally, most cnidarians have tentacles that surround their mouth and are used for feeding and sensing the environment. Therefore, all of these characteristics are exhibited by cnidarians.

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  • 2. 

    Which of the following type of skeleton is not found in cnidarians?

    • A.

      Hydrostatic

    • B.

      Limestone

    • C.

      Cartilage

    • D.

      Jelly like material

    Correct Answer
    B. Limestone
    Explanation
    Cnidarians have a hydrostatic skeleton, which is a fluid-filled cavity that provides support and shape to their bodies. Limestone is a type of rock and not a type of skeleton. It is not found in cnidarians or any other living organisms as a structural component. Therefore, the answer is limestone.

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  • 3. 

    Which of the following is not true of nematocytes ?

    • A.

      Located on the tentacles of cnidarians

    • B.

      Can sting their prey by injecting it with poison

    • C.

      Located in the mesoglea of cnidarians

    • D.

      Can secrete a sticky substance that causes the prey to stick to the tentacles

    Correct Answer
    C. Located in the mesoglea of cnidarians
    Explanation
    Nematocytes are specialized cells found in the tentacles of cnidarians, such as jellyfish and sea anemones. These cells are responsible for stinging their prey by injecting poison into them. They can also secrete a sticky substance that causes the prey to stick to the tentacles. However, nematocytes are not located in the mesoglea of cnidarians. The mesoglea is a jelly-like substance that fills the space between the outer epidermis and the inner gastrodermis of cnidarians. Therefore, the statement "located in the mesoglea of cnidarians" is not true of nematocytes.

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  • 4. 

    In sexual reproduction in cnidarians, fertilization generally takes place

    • A.

      On the tentacles

    • B.

      In the coelenteron

    • C.

      In the water column

    • D.

      In the mesoglea

    Correct Answer
    C. In the water column
    Explanation
    In cnidarians, fertilization generally takes place in the water column. This means that the male and female gametes are released into the surrounding water, where they come into contact and fertilization occurs. This method allows for the dispersal of gametes over a larger area, increasing the chances of successful fertilization. Additionally, cnidarians often have separate sexes, so this method allows for the mixing of gametes from different individuals. Fertilization in the water column also reduces the risk of self-fertilization, as the gametes have a higher chance of encountering gametes from different individuals.

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  • 5. 

    Corals and jelly fish are classified together mainly because they both

    • A.

      Have zooxanthellae

    • B.

      Have stinging tentacles

    • C.

      Have alternation of generation

    • D.

      Are marine

    Correct Answer
    B. Have stinging tentacles
    Explanation
    Corals and jellyfish are classified together mainly because they both have stinging tentacles. Stinging tentacles are a characteristic feature of cnidarians, which include corals and jellyfish. These tentacles contain specialized cells called cnidocytes that can inject venom into their prey or predators. This common trait is one of the main reasons why corals and jellyfish are classified together.

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