NEET 2011 Biology question

One very special feature in the earthworm Pheretima is that

(1)Fertilisation for eggs occurs inside the body
(2)The typhlosole greatly increases the effective absorption area of the digested food in the intestineCorrect
(3)The S-shaped setae embedded in the integument are the defensive weapons used against the enemies
(4)It has a long dorsal tubular heart

Answer: (2)

Solution

In Pheretima the intestinal wall is folded inwards in the middle part (from the 26th segment) as a median dorsal fold called the typhlosole, which increases the surface area for absorption of digested food. Fertilisation is external (in the cocoon, outside the

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Question ID VK-090829