Overview of Phylum Porifera
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Questions and Answers

What is the primary function of the water transport system in sponges?

  • It facilitates excretion only.
  • It serves as a reproductive structure.
  • It aids in locomotion and movement.
  • It enables food gathering, respiratory exchange, and waste removal. (correct)
  • What is true about the reproductive strategy of sponges?

  • Eggs and sperms are produced by separate individuals.
  • They are hermaphrodites producing both eggs and sperms. (correct)
  • They undergo external fertilization in most cases.
  • They exclusively reproduce asexually.
  • How is digestion achieved in sponges?

  • By a process of diffusion through the body wall.
  • By utilizing specialized stomach chambers.
  • Through external digestion followed by absorption.
  • Via intracellular digestion performed by choanocytes. (correct)
  • What structure lines the spongocoel in sponges?

    <p>Choanocytes.</p> Signup and view all the answers

    Which feature of sponges contributes to their primitive multicellular organization?

    <p>Cellular level of organization.</p> Signup and view all the answers

    What type of skeleton do sponges possess?

    <p>A skeleton composed of spicules or spongin fibers.</p> Signup and view all the answers

    What is the structural feature that allows water to enter the body of sponges?

    <p>Ostia</p> Signup and view all the answers

    What is the developmental characteristic of sponges?

    <p>Indirect development with a distinct larval stage</p> Signup and view all the answers

    Which of the following statements is true regarding sponge reproduction?

    <p>Sponges can reproduce both sexually and asexually</p> Signup and view all the answers

    What type of cellular organization characterizes sponges?

    <p>Cellular level organization</p> Signup and view all the answers

    Which components provide structural support to a sponge's body?

    <p>Spicules and spongin fibers</p> Signup and view all the answers

    Study Notes

    Overview of Phylum Porifera

    • Commonly known as sponges, members of Phylum Porifera are primarily marine and exhibit asymmetry.
    • Represent primitive multicellular organisms with a cellular level of organization.

    Water Transport System

    • Possess a unique canal system that facilitates water movement through the body.
    • Water enters through minute openings called ostia, flows into a central cavity known as the spongocoel, and exits through the osculum.
    • This water transport system aids in:
      • Food gathering
      • Respiratory exchange
      • Waste removal

    Cellular Structure and Digestion

    • The internal surface of the spongocoel and canals is lined with choanocytes (collar cells).
    • Digestion occurs intracellularly, meaning digestion takes place within the cells.

    Support and Skeleton

    • Sponges have a supportive skeleton made of spicules (microscopic structures) or spongin fibers.

    Reproductive Characteristics

    • Sponges are hermaphroditic, producing both eggs and sperm within the same individual.
    • Reproduction occurs:
      • Asexually by fragmentation (breaking apart and regeneration).
      • Sexually through the formation of gametes, with internal fertilization.
    • Development is indirect, involving a larval stage that is structurally different from the adult form.

    Overview of Phylum Porifera

    • Commonly known as sponges, members of Phylum Porifera are primarily marine and exhibit asymmetry.
    • Represent primitive multicellular organisms with a cellular level of organization.

    Water Transport System

    • Possess a unique canal system that facilitates water movement through the body.
    • Water enters through minute openings called ostia, flows into a central cavity known as the spongocoel, and exits through the osculum.
    • This water transport system aids in:
      • Food gathering
      • Respiratory exchange
      • Waste removal

    Cellular Structure and Digestion

    • The internal surface of the spongocoel and canals is lined with choanocytes (collar cells).
    • Digestion occurs intracellularly, meaning digestion takes place within the cells.

    Support and Skeleton

    • Sponges have a supportive skeleton made of spicules (microscopic structures) or spongin fibers.

    Reproductive Characteristics

    • Sponges are hermaphroditic, producing both eggs and sperm within the same individual.
    • Reproduction occurs:
      • Asexually by fragmentation (breaking apart and regeneration).
      • Sexually through the formation of gametes, with internal fertilization.
    • Development is indirect, involving a larval stage that is structurally different from the adult form.

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    Description

    This quiz focuses on the characteristics and biological systems of Phylum Porifera, commonly known as sponges. It covers their unique water transport system, cellular structure, and reproductive characteristics. Test your knowledge on these primitive multicellular organisms and their essential functions.

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