Q. Study the following in Pheretima. I.Dorso intestinal blood vessels II.External intestinal plexus III.Internal intestinal plexus IV.Ventro intestinal blood vessel Arrange the blood vessels in correct sequence of blood flow from ventral blood vessel to dorsal blood vessel. The correct sequence is
A) $IV \rightarrow II \rightarrow I \rightarrow III$
B) $III \rightarrow I \rightarrow II \rightarrow IV$
C) $II \rightarrow III \rightarrow IV \rightarrow I$
D) $IV \rightarrow II \rightarrow III \rightarrow I$
Explanation
There are five longitudinal blood vessels in Pheretima. Ventro-intestinal blood vessels supplies blood to integumentary nephridia. The dorso-intestinal blood vessel receives blood from intestine and a pair of cimmissural vessel.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.