Question

Open Circulatory system is present in:

• A. Palaemon, Nereis, Balanoglossus
• B. Hirudinaria, Bombyx, Salpa
• C. Anopheles, Limax, Limulus
• D. Pheretima, Musca, Pila

Answer 1

The Correct Option is C

An open circulatory system is characterized by the absence of blood vessels, and the haemolymph (blood-like fluid) directly bathes the tissues.
Anopheles (mosquito) is an arthropod, and arthropods have open circulatory systems.
Limax (slug) is a mollusc, and most molluscs (except cephalopods) have open circulatory systems.
Limulus (horseshoe crab) is an arthropod and has an open circulatory system.
The organisms in the other options have closed circulatory systems (Nereis, Balanoglossus, Hirudinaria, Salpa, Pheretima, Musca, Pila).