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🔬 Biology  ·  Animal Kingdom  ·  NEET

Which of the following correctly lists an order of increasing structural complexity in body cavity organization?

  • A Coelomate, pseudocoelomate, acoelomate
  • B Acoelomate, pseudocoelomate, coelomate
  • C Pseudocoelomate, coelomate, acoelomate
  • D Coelomate, acoelomate, pseudocoelomate

Correct answer: B. Acoelomate, pseudocoelomate, coelomate

Explanation: Acoelomates (e.g., Platyhelminthes) have no body cavity, pseudocoelomates (e.g., Nematoda) have a body cavity not fully lined by mesoderm, and coelomates (e.g., Annelida, Arthropoda, Chordata) have a true coelom completely lined by mesoderm.

Concept context

Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.

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