Which group of Kingdom Animalia has unsegmented, bilaterally symmetrical, soft bodies, with a triploblastic construction (comprising three layers of cells) and a lacking coelom, skeleton, and anus?

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SSC CGL 2023 Tier-I Official Paper (Held On: 24 Jul 2023 Shift 3)
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  1. Cnidaria
  2. Ctenophora
  3. Platyhelminthes
  4. Porifera

Answer (Detailed Solution Below)

Option 3 : Platyhelminthes
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Detailed Solution

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The correct answer is Platyhelminthes.Key Points

  • Platyhelminthes are also known as flatworms.
  • Flatworms have unsegmented, bilaterally symmetrical, soft bodies, with a triploblastic construction (comprising three layers of cells) and a lacking coelom, skeleton, and anus.
  • Example includes Planaria, Liver fluke (Fasciola hepatica), and Tapeworm.

Additional Information

  • Cnidaria includes jellyfish, corals, and sea anemones.
    • They have radial symmetry, a single body opening, and stinging cells called cnidocytes.
  • Ctenophora includes comb jellies.
    • They have radial symmetry and cilia for movement but also have a complete digestive system.
  • Porifera includes sponges.
    • They have asymmetrical or radial symmetry, no true tissues, and filter food through pores in their bodies.
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