Digestion and AbsorptionEasy
Question
One very special feature in the earthworm Pheretima is that
Options
A.the typhlosole greatly increases the effective absorption area of the digested food inthe intestine
B.The S-shaped setea emedded in the integument are the defensive weapons used againstthe enemies
C.it has a long dorsal tubular heart
D.fertilization of egg occurs inside the body
Solution
A pairs of short and conical intestinal caecae projects from the intestine on the 26thsegment. The characterstic feature of the intestine between 26-35 segments is the absenceof internal median folds of dorsal wall called typhlosole. This increases the effective areaof absorption in the intestine.
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