Q. One very special feature in the earthworm Pheretima is that
A) The typhlosole greatly increases the effective absorption area of the digested food in the intestine
B) The S-shaped setae embedded in the integument are the defensive weapons used against the enemies
C) It has a long dorsal tubular heart
D) Fertilization of eggs occurs inside the body
Explanation
A pair of short and conical intestinal caecae project from the intestine on the 26^(th) segment. The characteristic feature of the intestine between 26-35 segment is the presence of internal median fold of dorsal wall called typhlosole. This increases the effective area of absorption in the intestine
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.