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Difficulty: EasyHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

Which phylum of higher invertebrates is characterized by pentaradial symmetry in adult organisms and a water vascular system used for locomotion?

  1. EchinodermataAnswer
  2. B
    Annelida
  3. C
    Arthropoda
  4. D
    Mollusca

Answer

Echinodermata is the phylum characterized by pentaradial symmetry in adult organisms and a water vascular system.
Adult echinoderms exhibit five-part (pentaradial) radial symmetry and possess a specialized coelomic system known as the water vascular system, which powers tube feet for locomotion, food capture, and gas exchange.

Step-by-Step Solution

1
Identify the key anatomical features mentioned in the stem: pentaradial symmetry in adults and a water vascular system.
These diagnostic traits uniquely define the phylum Echinodermata.
Adult echinoderms (such as starfish, brittle stars, and sea urchins) develop pentaradial symmetry and operate a hydraulic water vascular system connected to tube feet.

Key Concept

Diagnostic features of Phylum Echinodermata
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Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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