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, $e.g.,$ arthropods (cockroach or$\ Periplaneta$).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.