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One very special feature in the earthworm Pheretima is that:

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

Solution & Step-by-step Explanation

The typhlosole is an internal median fold of the dorsal wall of the intestine (usually after segment 26) in earthworms. It serves to significantly increase the effective surface area for absorption of digested food.Fertilization is external (in cocoons).Setae are for locomotion.

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One very special feature in the earthworm Pheretima is that:
A
It has a long dorsal tubular heart
B
Fertilisation of eggs occurs inside the body
C
The typhlosole greatly increases the effective absorption area of the digested food in the intestine
D
The S-shaped setae embedded in the integument are the defensive weapons used against the enemies

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Structural OrganizationEarthworm

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