Q. Which one of the following has an open circulatory system?
A) Pheretima
B) Periplaneta
C) Hirudinaria
D) Octopus
Explanation
In open circulatory system, the blood flows in open spaces like lacunae and sinuses and it bathes the cells directly, eg, arthropods (cockroach or Periplaneta).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.