Question

a paragraph on morophology of earthworm

Answer 1

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MORPHOLOGY OF EARTHWORM

Earthworms have a tube-like arrangement or cylindrical shaped and reddish-brown segmented body. The body is divided into small segments. The dorsal side is characterized by a dark line of blood vessels and ventral side is characterized by the gential openings. The mouth and the prostomium (an organ helps in burrowing) distinguish the anterior end.

The segments 14-16 of a matured earthworm consist of a glandular tissue called clitellum which helps us to distinguish the mouth and tail ends. The body is divided into three segments with respect to clitellum - preclitellar, clitellar, and postclitellar.

Earthworms are hermaphrodites I.e., they carry both male and female s*x organs. Segments 5-9 accommodate four pairs of spermathecal apertures. The female genital pore is situated at the 14th segment and a pair of male genital pores is situated at the 18th segment. The body consists of S-shaped setae, which help in locomotion in the earthworm. Setae are present in each segment except in the first, last and clitellum segments.

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