Question

Flow of blood in dorsal blood vessel of earthworm is

• A. Backward
• B. Forward
• C. Sideward
• D. Downward

Answer 1

The correct option is B Forward

Pheretima exhibits a closed type of blood vascular system, consisting of blood vessels, capillaries, and heart. Due to the closed circulatory system, blood is confined to the heart and blood vessels. Contractions keep blood circulating in one direction. Smaller blood vessels 'supply the gut, nerve cord, and the body wall. Hence blood flows only in one direction i.e forwardly.

So the correct answer is 'Forward'.