NEET2011ZoologyStructural Organisation in AnimalsActual
One very special feature in the earthworm Pheretima is that
Options
- Athe typhlosole greatly increases the effective absorption area of the digested food in the intestine
- Bthe S-shaped setae embedded in the integument are the defensive weapons used against the enemies
- Cit has a long dorsal tubular heart
- Dfertilization of eggs occurs inside the body
Correct answer
A. the typhlosole greatly increases the effective absorption area of the digested food in the intestine
Step-by-step solution
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 segments is the presence of internal median fold of dorsal wall called typhlosole. This increases the effective area of absorption in the intestine.