Question

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Answer 1

Parasitic Adaptations of leech

•Sense organs

THE only sense-organs hitherto known in the medicinal leech

are the five pairs of eyes and the so-called " goblet-shaped "

organs located in the edge of the lip (cephalic lobe). A number

of writers have noticed and described some small spots occurring on every fifth ring of the body; and one author has suggested that they may have a respiratory function. - But no one, so far as the published accounts inform us, has intimated that they represented sense-organs. or suspected that they were the serial homoogues of the eyes themselves. These spots, when examined closely with a low magnifying power, will be found to be slight elevations with rounded summits, and for this reason and because they are regularly disposed on the first ring of each segment (somite) they may be called segmental papille, a name which does not prejudge the question of their function.

•Slow digestion

Digestion occurs over several weeks and is thought to occur mostly in the intestinum. Due to effective storage and slow digestion, the leech can go for 6 months between feedings.

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