Question

Blood pigment of annelids is:

• A. Haemoglobin
• B. Cyanin
• C. Haemanin
• D. Haemocyanin

Answer 1

The correct option is A Haemoglobin

• In most Annelida species the circulatory system is closed.
• The blood usually contains hemoglobin, a red oxygen-carrying pigment; some annelids have a green oxygen-carrying pigment, and others have unpigmented blood.
• The circulatory system is usually closed, i.e., confined within well-developed blood vessels in some polychaetes and leeches the circulatory system is partly open, with blood and coelomic fluid mixing directly in the sinuses of the body cavity.
• So, the correct answer is option A.