Q. Which of the following animals has an open type of circulatory system, in which cells and tissues are directly bathed in blood?
A) Annelida
B) Chordata
C) Cyclostomata
D) Arthropoda
Explanation
Arthropods have an open circulatory system. Annelids and chordates (including cyclostomes) have a closed system with blood circulating through vessels.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.