Question

Open type of blood vascular system, presence of haemocyanin pigment are the character of

• A. Mollusca
• B. Arthropoda
• C. Echinodermata
• D. Both A and B
  

Answer 1

Answer: (D)

Both A and B

The open type of blood vascular system is present in molluscs and arthropods. This type of system pumps the blood into the hemocoel. The blood will diffuse and come back to the circulatory system. Blood is pumped by the heart into the body cavities. There are tissues in the body cavities which are surrounded by the blood. The blood contains the pigments called as hemocyanin proteins. These proteins are involved in the transport oxygen in such invertebrates.

Thus, the correct answer is option D.