In which group of animals, coelom is filled with blood?
(a) Arthropoda
(b) Annelida
(c) Nematoda
(d) Echinodermata
Answer- (a)
Solution- Annelida, Nematoda and Echinodermata don’t have blood and Arthropods coelom is filled with blood.
Annelids, arthropods and molluscs contain coelom that is a fluid-filled cavity present between the gut and mesoderm. The coelom of arthropods is filled with blood called as hemocoel. The circulating fluid in these organisms is called as hemolymph.
The correct answer is a)- Arthropoda