One very special feature in the earthworm (Pheretima) is that:
Correct answer: B. The typhlosole greatly increases the effective absorption area of the digested food in the intestine
- A. Fertilization of eggs occurs inside the body
- B. The typhlosole greatly increases the effective absorption area of the digested food in the intestine
- C. The S-shaped setae embedded in the integument are the defensive weapons used against the enemies
- D. It has a long dorsal tubular heart
Explanation
In Pheretima, the intestine is next to the stomach. It is a long, wide and thin-walled tube extending from the 15th segment to the last. The second or middle part of the intestine lies between the 27th segment up to the 23-25th segments in front of the anus. This is characterised by the presence of a highly glandular and vascular longitudinal ridge, arising as a median ingrowth of the dorsal aspect of the intestinal cavity. This is called the typhlosole. The typhlosole greatly increases the effective absorption area of the digested food in the intestine.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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