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NTA Abhyas NEET2020BotanyAnimal KingdomPractice

Members of which phylum lack a well-defined circulatory system and respiratory system?

Options

  1. AAschelminthes
  2. BAnnelida
  3. CArthropoda
  4. DHemichordata

Correct answer

A. Aschelminthes

Step-by-step solution

The circulatory system was seen for the first time in phylum Annelida and shows a closed type of circulatory system, while Arthropoda and hemichordate shows an open type of circulatory system. In phylum Aschelminthes (Nemathelminthes) the circulatory system and respiratory system are absent.

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