In which group of animals, coelom is filled with blood?(A) Arthropoda (B) Annelida (C) Nematoda (D) Echinodermata

In Arthropoda, coelom is filled with blood.\r
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The true coelom means a body cavity that arises as a cavity in embryonic mesoderm. \r
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In arthropods, annelids and Mollusca, true coelom develops by splitting up of mesoderm, while in the cavity of Arthropoda and non-cephalopoda molluscs a colourless blood is present and is called haemocoel.\r
In echinoderms and chordates, the mesoderm layer arises from the wall of embryonic gut or enteron as empty outgrowths or enterocoelomic pouches.\r
In coelentrates body cavity or coelomic cavity is absent.

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Updated on: 10-Oct-2022

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