Question

what is the morphology of round worm​

Answer 1

Answer:

Ascaris lumbricoides is the "large roundworm" of humans, growing to a length of up to 35 cm (14 in).it is one of several species of Ascaris. An ascarid nematode of the phylum Nematoda, it is the most common parasitic worm in humans. This organism is responsible for the disease ascariasis, a type of helminthiasis and one of the group of neglected tropical diseases. An estimated one-sixth of the human population is infected by A. lumbricoides or another roundworm. Ascariasis is prevalent worldwide, especially in tropical and subtropical countries.

Ascaris lumbricoides is characterized by its great size. Males are 2–4 mm (0.08–0.2 in) in diameter and 15–31 cm (5.9–12 in) long. The male's posterior end is curved ventrally and has a bluntly pointed tail. Females are 3–6 mm (0.1–0.2 in) wide and 20–49 cm (7.9–19 in) long. The vulva is located in the anterior end and accounts for about one-third of its body length. Uteri may contain up to 27 million eggs at a time, with 200,000 being laid per day. Fertilized eggs are oval to round in shape and are 45–75 μm (0.0018–0.0030 in) long and 35–50 μm (0.0014–0.0020 in) wide with a thick outer shell. Unfertilized eggs measure 88–94 μm (0.0035–0.0037 in) long.

Answer 2

Ascaris resembles an ordi­nary earthworm and is the largest intestinal nema­tode parasitising man. It is milk-white in colour but presents a reddish-yellow shade. Body is elon­gated, cylindrical, and gradually tapering at both ends. The females are usually 20-25 cm in length and 5 mm in diameter while the males are 15-17 cm in length and 3 mm in diameter.

Female worms are larger than the males and are further distinguished by the presence of separate and independent genital aperture or vulva on the ven­tral surface at about one-third of the body’s total length from the anterior end. The post anal por­tion in the male is sharply curved downwards while in the female it is nearly straight

Tail end of male is characterised by the presence of numerous genital papillae on the ventral surface. There are about 50 pairs of pre-anal papillae and 5 pairs of post-anal papillae. These genital papillae of male help in copulation. While in female only one pair caudal papillae are present.

A triangular mouth is situated at the anterior end and is bounded by three lips, one median and dorsal, and two ventro-lateral in position. Each lip is provided with denticles in its inner margin and sensory papillae on the outer margin. In male the anus is replaced by cloaca which is situated posteriorly about 2 mm from the pos­terior end on the ventral surface. It is the common aperture for digestive and genital tubes. In male a pair of needle like chitinoid bodies project from this aperture which are known as penial setae or spicules.

These spicules serve to transfer sperms into female vagina during copulation. In male a little down the anterior tip and on the ventral sur­face is the excretory pore. The female has an anus a little in front of the posterior end on the ventral surface. Only the digestive tube opens to outside through anus.

The body is marked with four longitudinal streaks or lines running along the entire length of the body. Of these four streaks, one is dorsal, one is ventral and two are lateral in position.

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