Q. Which of the following statement is correct about the circulatory system of Annelida?
Solution:
Solution:
In the circulatory system of mollusca, the respiratory pigment is copper-containing haemocyanin dissolved in plasma. In Annelida, the respiratory pigment is haemoglobin dissolved in plasma. Unlike most mollusca, annelids have a closed circulatory system. In a closed circulatory system, blood is always contained within blood vessels. Annelids do not have a central, well-developed heart, and usually, the muscular dorsal blood vessel functions to pump blood through the circulatory system.