Question

In earthworm dorsal blood vessel and collecting channel are located

• A. Behind ${14}^{th}$ segment
• B. Anterior to ${13}^{th}$ segment
• C. Throughout the segmented body
• D. In typhlosolar region

Answer 1

The correct option is A Behind ${14}^{th}$ segment

The dorsal blood vessel appears as a dark brownish red vessel running along the top of the intestine. Circulatory fluids travel from the arches through the ventral blood vessel to the capillary beds in the body. The fluids then collect in the dorsal blood vessel and re-enter the aortic arches. This dorsal blood vessel starts from segment 14${}^{th}$ onwards in case of earthworms. So, the correct answer is option A.