Question

Select the correct set of organisms in which open circulatory system is present.

• A. Octopus, Sepia, Unio
• B. Prawn, Loligo, Sepia
• C. Snails, Unio, Mussel
• D. Mussel, Octopus, Unio

Answer 1

The correct option is C Snails, Unio, Mussel

In an open circulatory system, blood capillaries are absent and the blood flows through open spaces (sinuses) and remains in direct contact with tissues and cells. It is found in the arthropods and non-cephalopod molluscs. In Snails, Unio and Mussels open circulatory system is present.