Question

In earthworm, arrangement of blood vessels are

• A. Different in last fifteen segments
• B. Different in first thirteen segments
• C. Same throughout
• D. Different in middle thirteen segments

Answer 1

Answer: (B)

Different in first thirteen segments

The blood vessels of earthworm are grouped into three types, as the longitudinal, the lateral and the intestinal plexuses. The nature and arrangement of the blood vessels in the first 13 segments are different from the segments behind 13. So, the correct answer is option B.