Q. In Pheretima, the number of ring vessels per segment in 12^(th) and 13^(th) segments is
A) 10 pairs
B) 11 pairs
C) 12 pairs
D) 24 pairs
Explanation
In Pheretima, the fing vessels are characteristic circular vessels of stomach situated with its muscular coat. There are about 12 vessels per segment.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.