Bilateral Symmetry in Animals
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Questions and Answers

Which type of symmetry is characteristic of animals in the Bilateria grade?

  • Asymmetrical symmetry
  • Bilateral symmetry (correct)
  • Radial symmetry
  • Spherical symmetry

    • In which phylum are animals with bilateral symmetry included?

  • Ctenophora
  • Platyhelminthes (correct)
  • Cnidaria
  • Porifera

    • What type of symmetry do adult Echinoderms typically have?

  • Bilateral symmetry
  • Asymmetrical symmetry
  • Radial symmetry (correct)
  • Spherical symmetry

    • What is a key characteristic of animals in the Bilateria grade?

    <p>Presence of clearly differentiated head and distinct anterior end</p> Signup and view all the answers

    Which phyla are included in the Bilateria grade?

    <p>Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda, Echinodermata, Hemichordata, Chordata</p> Signup and view all the answers

    What type of symmetry do adult Echinoderms typically have?

    <p>Radial symmetry</p> Signup and view all the answers

    What is a key characteristic of animals in the Bilateria grade?

    <p>Distinct anterior and posterior ends</p> Signup and view all the answers

    What is the defining feature of bilateral symmetry in animals?

    <p>The right side is approximately the same as the left side</p> Signup and view all the answers

    What type of symmetry do animals in the Bilateria grade typically exhibit?

    <p>Bilateral symmetry</p> Signup and view all the answers

    Which phylum includes animals that have secondarily developed radial symmetry as adults?

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

    What is the defining feature of animals with bilateral symmetry?

    <p>Distinct anterior end</p> Signup and view all the answers

    Which animals are included in the Bilateria grade?

    <p>Annelida, Arthropoda, Chordata</p> Signup and view all the answers

    Which phylum includes animals that have secondarily developed radial symmetry as adults?

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

    Which of the following phyla is not included in the Bilateria grade?

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

    Which type of symmetry do adult Echinoderms typically have?

    <p>Radial symmetry</p> Signup and view all the answers

    Which characteristic is common to all animals included in the Bilateria grade?

    <p>Distinct dorsal and ventral surfaces</p> Signup and view all the answers

    Which phylum includes animals that have secondarily developed radial symmetry as adults?

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

    What type of symmetry do adult Echinoderms typically have?

    <p>Radial symmetry</p> Signup and view all the answers

    What is a key characteristic of animals in the Bilateria grade?

    <p>Distinct anterior and posterior ends</p> Signup and view all the answers

    Which characteristic is common to all animals included in the Bilateria grade?

    <p>Distinct dorsal and ventral surfaces</p> Signup and view all the answers

    What type of symmetry do adult Echinoderms typically have?

    <p>Radial symmetry</p> Signup and view all the answers

    What is a key characteristic common to all animals included in the Bilateria grade?

    <p>Distinct anterior and posterior ends</p> Signup and view all the answers

    In which phylum are animals with bilateral symmetry included?

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

    What is the defining feature of bilateral symmetry in animals?

    <p>Right side approximately same as left side</p> Signup and view all the answers

    Match the following phyla with their inclusion in the Bilateria grade:

    <p>Platyhelminthes = Included in the Bilateria grade Nematoda = Included in the Bilateria grade Arthropoda = Included in the Bilateria grade Echinodermata = Includes animals with secondarily developed radial symmetry as adults</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Bilateral symmetry = Distinct anterior end and can be divided into two equal parts by an imaginary line in one plane Radial symmetry = Can be divided into equal parts by several planes passing through a central axis Triploblastic = Composed of three primary germ layers Coelomate = Has a true body cavity derived from mesoderm</p> Signup and view all the answers

    Match the following characteristics with their presence in animals of the Bilateria grade:

    <p>Distinct anterior and posterior ends = Present in animals of the Bilateria grade Dorsal and ventral surfaces = Present in animals of the Bilateria grade Acoelomate body plan = May be present in animals of the Bilateria grade Radial symmetry in adults = Present in Echinodermata due to their special mode of life</p> Signup and view all the answers

    Match the following phyla with their type of symmetry in adult animals:

    <p>Platyhelminthes = Bilateral symmetry Nematoda = Bilateral symmetry Mollusca = Bilateral symmetry Echinodermata = Secondarily developed radial symmetry</p> Signup and view all the answers

    Match the following phyla with their inclusion in the Bilateria grade:

    <p>Platyhelminthes = Included Nematoda = Included Cnidaria = Not included Echinodermata = Included</p> Signup and view all the answers

    Match the following phyla with their type of symmetry in adult animals:

    <p>Platyhelminthes = Bilateral Nematoda = Bilateral Cnidaria = Radial Echinodermata = Radial</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Acoelomate = No body cavity Pseudocoelomate = Body cavity not completely lined with mesoderm Coelomate = Body cavity completely lined with mesoderm Triploblastic = Three germ layers (ectoderm, mesoderm, endoderm)</p> Signup and view all the answers

    Match the following characteristics with their presence in animals of the Bilateria grade:

    <p>Bilateral symmetry = Present Triploblastic = Present Radial symmetry = Not present Distinct anterior and posterior ends = Present</p> Signup and view all the answers

    Animals with bilateral symmetry can be divided into two equal parts by an imaginary line in more than one plane.

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

    All animals included in the Bilateria grade are triploblastic.

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

    Adult Echinoderms have secondarily developed radial symmetry due to their special mode of life.

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

    Animals with bilateral symmetry typically exhibit clearly defined dorsal and ventral surfaces.

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

    Animals with bilateral symmetry can be divided into two equal parts by an imaginary line only in one ______

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

    Adult Echinoderms have secondarily developed ______ symmetry due to their special mode of life

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

    The animals included in grade Bilateria are all ______

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

    The animals in the Bilateria grade typically exhibit clearly defined dorsal and ventral ______

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

    Animals with bilateral symmetry can be divided into two equal parts by an imaginary line only in one ______

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

    What is the defining feature of bilateral symmetry in animals?

    <p>distinct anterior end</p> Signup and view all the answers

    Animals in the Bilateria grade typically exhibit clearly defined dorsal and ventral ______

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

    All animals included in the Bilateria grade are ______

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

    Explain the defining characteristics of animals with bilateral symmetry and provide examples of phyla included in this group.

    <p>Animals with bilateral symmetry have a body plan where the right side is approximately the same as the left side, with a distinct anterior and posterior end. They can be divided into two equal parts by an imaginary line in only one plane and typically have clearly defined dorsal and ventral surfaces. Phyla included in this group are Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda, Echinodermata, Hemichordata, and Chordata.</p> Signup and view all the answers

    Describe the development of radial symmetry in adult Echinoderms and explain why it occurs.

    <p>Adult Echinoderms have secondarily developed radial symmetry due to their special mode of life. Their larvae initially exhibit bilateral symmetry, but as they mature and adapt to their specific ecological niche, they develop radial symmetry as a more advantageous body plan for their lifestyle.</p> Signup and view all the answers

    Discuss the triploblastic nature of animals included in the Bilateria grade and explain the possible body cavity types they may exhibit.

    <p>All animals included in the Bilateria grade are triploblastic, meaning they have three germ layers: ectoderm, mesoderm, and endoderm. They may be acoelomate, pseudocoelomate, or coelomate, depending on the presence and formation of a body cavity.</p> Signup and view all the answers

    Explain the significance of the distinct anterior and posterior ends in animals with bilateral symmetry and how this relates to their body plan.

    <p>The distinct anterior and posterior ends in animals with bilateral symmetry provide orientation and directionality. The presence of a clear anterior end often indicates the location of sensory organs and the direction of movement, while the posterior end may be associated with waste elimination and locomotion. This orientation contributes to the overall functionality of their body plan and behavior.</p> Signup and view all the answers

    Study Notes

    Characteristics of Bilateria

    • Animals with bilateral symmetry, where the right side is approximately the same as the left side and has a distinct anterior end.
    • Can be divided into two equal parts by an imaginary line only in one plane.
    • Typically have a clearly differentiated head at the anterior end and a distinct posterior end.
    • Have clearly defined dorsal and ventral surfaces.

    Phyla Included in Bilateria

    • Phyla included in this grade are Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda, Echinodermata, Hemichordata, and Chordata.

    Echinodermata

    • Have developed bilateral symmetry, evident from the study of their larvae structure.
    • Adult Echinoderms have secondarily developed radial symmetry due to their special mode of life.

    Body Structure

    • All animals in grade Bilateria are triploblastic.
    • May be acoelomate, pseudocoelomate, or coelomate.

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    Description

    Test your knowledge of bilateral symmetry in animals with this quiz! Learn about the unique characteristics of animals with bilateral symmetry and how they differ from other types of symmetry in the animal kingdom. Challenge yourself with questions about the distinct anterior end, equal division into two parts, and more.

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