Identify the organism that is NOT a pseudocoelomate.

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SSC CGL 2022 Tier-I Official Paper (Held On : 02 Dec 2022 Shift 1)
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  1. Ancylostoma
  2. Ascaris
  3. Wuchereria
  4. Scorpions

Answer (Detailed Solution Below)

Option 4 : Scorpions
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SSC CGL Tier 1 2025 Full Test - 01
100 Qs. 200 Marks 60 Mins

Detailed Solution

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The correct answer is Scorpions.

Key Points

  • The coelom is the fluid-filled cavity between the body wall and the gut wall.
  • The coelom is lined by mesoderm.
  • The coelom is one of the characteristic features of metazoans.
  • Based on the presence or absence of coelom, organisms are classified into three groups:
    • Coelomates
    • Pseudocoelomates
    • Acoelomates
  • In Pseudocoelomates, the body cavity is not lined by mesoderm.
  • Aschelminthes are pseudocoelomate organisms.

Additional Information

  • The coelom is the principal body cavity in most animals, located between the intestinal canal and the body wall.
  • Coelomates refer to animals having fluid-filled body cavities called coeloms located within the mesoderm. Annelids, molluscs, arthropods, and echinoderms are some examples of Coelomates.
  • Pseudocoelom means "false coelom" or "false cavity".

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