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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)
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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