One very special feature in the earthworm pheretima is that

  • Option 1)

    Fertilisation for eggs occurs inside the body

  • Option 2)

    the typhlosole greatly increases the effective absorption area of the digested food in the intestine

  • Option 3)

    the S-shaped setae embedded in the integument are the defensive weapons used against the enemies

  • Option 4)

    it has a long dorsal tubular heart

 

Answers (1)
V Vakul

 

Earth worm (Pheretima Posthuma) -

it belongs to phylum Annelida, class-Oligochaeta. Earthworm is a nocturnal animal because it is sensitive to light.

-

 

 A pair of short and conical intestinal caecae project from the intestine on the 26th segment. The characteristic feature is interesting between 26-35 segments is the presence of an internal median fold of dorsal wall called typhlosole. This increases the effective area of absorption in the intestine.


Option 1)

Fertilisation for eggs occurs inside the body

This solution is incorrect 

Option 2)

the typhlosole greatly increases the effective absorption area of the digested food in the intestine

This solution is correct 

Option 3)

the S-shaped setae embedded in the integument are the defensive weapons used against the enemies

This solution is incorrect 

Option 4)

it has a long dorsal tubular heart

This solution is incorrect 

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