Question

Open circulatory system is present in
(A) Arthropods (B) Annelids
(C) Chordates (D) Molluscs

• A. C only
• B. C and B
• C. A and B
• D. D only
• E. A only
• F. A and D

Answer 1

The correct option is F A and D

The open circulatory system is common to molluscs and arthropods. Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.

So, the correct option is 'A and D'.