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

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

NTA AbhyasNTA Abhyas 2020Animal Kingdom

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.