Open Circulatory system is present in :
- Palaemon, Nereis, Balanoglossus
- Hirudinaria, Bombyx, Salpa
- Anopheles, Limax, Limulus
- Pheretima, Musca, Pila
Answer
(3) Anopheles, Limax, Limulus
Solution
Arthropods and molluscs have an open circulatory system; annelids and chordates have a closed circulatory system.
(1) Nereis (annelid) – closed.
(2) Hirudinaria (annelid) and Salpa (chordate) – closed.
(3) Anopheles (arthropod), Limax (mollusc) and Limulus (arthropod) – all open.
(4) Pheretima (annelid) – closed.
Answer: (3)