Porifera, Cnidaria, Platyhelminthes, & Nematoda

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  • 1/9 Questions

    Which Phylum is known as the sponges?

    • Cnidaria
    • Nematoda
    • Platyhelminthes
    • Porifera
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Porifera, Cnidaria, Platyhelminthes, & Nematoda - Quiz
About This Quiz

Explore the distinguishing features of various animal phyla including Porifera, Cnidaria, Platyhelminthes, and Nematoda. This quiz assesses knowledge on radial symmetry, digestive systems, and specific animal classifications, enhancing understanding of invertebrate biology.

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  • 2. 

    Which phylum do jellyfish belong to?

    • Cnidaria

    • Nematoda

    • Platyhelminthes

    • Porifera

    Correct Answer
    A. Cnidaria
    Explanation
    Jellyfish belong to the phylum Cnidaria. This phylum includes a diverse group of animals that have specialized cells called cnidocytes, which they use to capture prey and defend themselves. Jellyfish have a gelatinous body and typically have tentacles with stinging cells. They are found in marine environments worldwide and play important roles in marine ecosystems.

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  • 3. 

    Which phylum is known as the flatworms?

    • Cnidaria

    • Nematoda

    • Platyhelminthes

    • Porifera

    Correct Answer
    A. Platyhelminthes
    Explanation
    Platyhelminthes is the correct answer because it is the phylum commonly known as flatworms. This phylum includes various species of worms that have a flattened body shape. They are characterized by their soft, unsegmented bodies and lack of a body cavity. Platyhelminthes encompass a diverse group of organisms, including tapeworms, flukes, and planarians.

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  • 4. 

    Tiny spike like structures of porifera.

    • Amebocyte

    • Choanocyte

    • Ostia

    • Spicule

    Correct Answer
    A. Spicule
    Explanation
    Spicules are tiny spike-like structures found in porifera, which are also known as sponges. These structures provide support and protection to the sponge. They are made up of various materials such as calcium carbonate or silica. Spicules can come in different shapes and sizes, depending on the species of sponge. They play a crucial role in maintaining the structural integrity of the sponge and also help in defense against predators.

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  • 5. 

    Free swimming form of the cnidarians.

    • Budding

    • Cnidocytes

    • Medusa

    • Polyp

    Correct Answer
    A. Medusa
    Explanation
    Medusa is the correct answer because it refers to the free-swimming form of cnidarians. Cnidarians, such as jellyfish, have two main body forms: the sessile polyp and the free-swimming medusa. The medusa form is characterized by a bell-shaped body with tentacles hanging down, allowing for movement in the water. This form is responsible for reproduction and dispersal of cnidarian species.

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  • 6. 

    Which phylum is characterized by radial symmetry?

    • Cnidaria

    • Nematoda

    • Platyhelminthes

    • Porifera

    Correct Answer
    A. Cnidaria
    Explanation
    Cnidaria is the correct answer because this phylum is known for its radial symmetry. Radial symmetry means that the body of an organism can be divided into equal halves in multiple planes, with each half mirroring the other. Cnidarians, such as jellyfish and sea anemones, exhibit this type of symmetry, with their body parts arranged around a central axis. In contrast, Nematoda, Platyhelminthes, and Porifera do not display radial symmetry.

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  • 7. 

    Nematodes have what type of body cavity?

    • Acoelom

    • Coelom

    • Pseudocoelom

    Correct Answer
    A. Pseudocoelom
    Explanation
    Nematodes have a pseudocoelom, which is a body cavity that is not completely lined by mesoderm. This means that the organs in the body of nematodes are not completely surrounded by a fluid-filled cavity, but rather are suspended in a fluid-filled space that is partially lined by mesoderm. This type of body cavity provides some protection and support for the organs, but it is not as well-developed as a true coelom, which is a body cavity that is completely lined by mesoderm.

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  • 8. 

    The stinging cells of cnidarians.

    • Cnidocytes

    • Medusa

    • Nematocyst

    • Polyp

    Correct Answer
    A. Cnidocytes
    Explanation
    Cnidocytes are the specialized cells found in cnidarians, such as jellyfish and corals, that are responsible for delivering a sting. These cells contain a structure called a nematocyst, which is a coiled thread-like tube that is ejected when triggered. The nematocyst injects venom into the prey or predator, immobilizing or killing it. Cnidocytes are found in both the medusa (bell-shaped) and polyp (tube-shaped) forms of cnidarians, making them an essential defense mechanism for these organisms.

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  • 9. 

    Which phylum was the first to have a one way digestive system?

    • Cnidaria

    • Nematoda

    • Platyhelminthes

    • Porifera

    Correct Answer
    A. Nematoda
    Explanation
    Nematoda is the correct answer because it is the first phylum to have a one-way digestive system. This means that food enters through one end of the digestive tract and exits through the other end, allowing for a more efficient digestion process. Cnidaria, Platyhelminthes, and Porifera do not have a one-way digestive system, making Nematoda the correct choice.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 05, 2010
    Quiz Created by
    Thomasc
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