Phylum Porifera MCQ Questions With Answers

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Phylum Porifera MCQ Questions With Answers - Quiz

Do you have enough knowledge about the Phylum Porifera? If yes, then solve this Phylum Porifera quiz that consists of Multiple Choice Questions (provided with answers) and check for yourself. Basically, the Porifera are the lowest multicellular immobile organisms of the kingdom Animalia, and their bodies are full of pores. Sponges commonly constitute them. Did you know about these interesting things already? If so, take up the quiz below and check how strong your biology is. Good luck, buddy!


Questions and Answers
  • 1. 

    Which one of the following is not typical to all Poriferas?

    • A.

      Presence of spongin fibres

    • B.

      System of pores and canal

    • C.

      Perforated body

    • D.

      Choanocytes

    Correct Answer
    A. Presence of spongin fibres
    Explanation
    Poriferas, also known as sponges, are multicellular organisms that lack true tissues and organs. They have a unique body structure characterized by a system of pores and canals, a perforated body, and choanocytes, which are specialized cells involved in filter feeding. However, not all Poriferas possess spongin fibers. Spongin fibers are a type of protein that provide structural support to some sponge species, but they are not present in all Poriferas. Therefore, the presence of spongin fibers is not typical to all Poriferas.

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  • 2. 

    The outer layer of a sponge is composed of what?

    • A.

      Pinacocytes

    • B.

      Choancytes

    • C.

      Amebocytes

    • D.

      Spongocoel

    Correct Answer
    A. Pinacocytes
    Explanation
    The outer layer of a sponge is composed of pinacocytes. Pinacocytes are flat cells that form a protective covering over the sponge's body. They are responsible for maintaining the structure and integrity of the sponge, as well as regulating water flow and gas exchange. These cells are tightly packed together, forming a barrier that helps to prevent the entry of foreign particles or organisms into the sponge's internal cavity.

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  • 3. 

    What type of symmetry does Porifera have?

    • A.

      Asymmetrical symmetry

    • B.

      Round symmetry

    • C.

      Oval symmetry

    • D.

      Bilateral

    Correct Answer
    A. Asymmetrical symmetry
    Explanation
    Porifera, or sponges, exhibit asymmetrical symmetry, lacking a specific symmetry plane. Their bodies lack a consistent arrangement of body parts, and they don't display radial or bilateral symmetry. Instead, their structure is irregular and varied, making them an example of asymmetry in the animal kingdom.

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  • 4. 

    What is true about sponges?

    • A.

      One mouth, innumerable exits

    • B.

      Large spacious stomach

    • C.

      Spicules are composed of chitin

    • D.

      Innumerable mouths, one exit

    Correct Answer
    D. Innumerable mouths, one exit
    Explanation
    Sponges have innumerable mouths, meaning they have multiple openings through which they can take in water and filter out nutrients. However, they only have one exit through which waste and filtered water are expelled. This unique characteristic allows sponges to efficiently capture food particles and remove waste from their bodies.

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  • 5. 

    What is true about the members of phylum Porifera?

    • A.

      Most of them are freshwater animals but few are marine entities.

    • B.

      Most of them are marine animals but few are freshwater entities.

    • C.

      All are freshwater animals

    • D.

      All are marine animals

    Correct Answer
    B. Most of them are marine animals but few are freshwater entities.
    Explanation
    Most of the members of phylum Porifera are marine animals, but there are also a few that are found in freshwater environments.

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  • 6. 

    What do sponges eat?

    • A.

      Detritus

    • B.

      Plankton

    • C.

      Viruses

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Sponges are filter feeders that obtain their food by filtering water through their bodies. They primarily feed on detritus, which includes dead organic matter and waste particles. Sponges also consume plankton, which are microscopic organisms drifting in the water. Additionally, some sponges are capable of ingesting viruses, which they can digest and obtain nutrients from. Therefore, the correct answer is "all of the above" as sponges have the ability to eat detritus, plankton, and viruses.

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  • 7. 

    How do sponges reproduce?

    • A.

      Sexually

    • B.

      Asexually

    • C.

      Both sexually and asexually

    • D.

      None of the above

    Correct Answer
    C. Both sexually and asexually
    Explanation
    Sponges reproduce both sexually and asexually. They can reproduce asexually through a process called budding, where a small part of the sponge grows and eventually detaches to form a new individual. They can also reproduce sexually by releasing eggs and sperm into the water, where fertilization occurs externally. This allows for genetic diversity and the production of offspring with different traits.

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  • 8. 

    The hard "skeletal" structures in a sponge are called

    • A.

      Pinococytes

    • B.

      Spongin

    • C.

      Amebocytes

    • D.

      Spicules

    Correct Answer
    D. Spicules
    Explanation
    Spicules are the hard "skeletal" structures found in sponges. These structures provide support and structure to the sponge's body. Spicules are typically made of calcium carbonate or silica and vary in shape and size depending on the species of sponge. They help to maintain the sponge's shape and provide protection against predators.

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  • 9. 

    What does the name Porifera mean?

    • A.

      Pore bearer

    • B.

      Very large hole

    • C.

      Multicellular

    • D.

      Unicellular

    Correct Answer
    A. Pore bearer
    Explanation
    The name Porifera means "pore bearer". This is because Porifera is the scientific name for sponges, which are multicellular organisms that have many tiny pores or openings on their bodies. These pores allow water to flow through the sponge, enabling them to filter out food particles and oxygen. Therefore, "pore bearer" accurately describes the characteristic feature of sponges.

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  • 10. 

    Choanocyte cells create a current that bring in O2 and small molecules and carry away CO2 and NH3. What part of a Coanocyte sets up a water current?

    • A.

      Pseudopodia

    • B.

      Flagellum

    • C.

      Spicules

    • D.

      An umbrella

    Correct Answer
    B. Flagellum
    Explanation
    The flagellum is responsible for setting up a water current in a coanocyte. Coanocytes are specialized cells found in sponges that have flagella, which are whip-like structures that can beat and create a flow of water. The movement of the flagellum creates a current that brings in oxygen and small molecules, while also carrying away carbon dioxide and ammonia. This allows for efficient exchange of gases and nutrients within the sponge's body.

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