Does the Ascaris have any external sense organs?

Ascaris Sense organs The following are the sense organs of these roundworms. Papillae: They are in the form of small villi situated on different body parts. a) Labial papillae– They are formed by sensory cells surrounded by many supporting cells. These are gustatoreceptors and present on three lips surrounding mouth.

What are the characteristic features of the eggs of Ascaris?

Fertilized eggs are are rounded and have a thick shell with an external mammillated layer that is often stained brown by bile. In some cases, the outer layer is absent (known as decorticated eggs). Fertile eggs range from 45 to 75 µm in length.

What two external characteristics Did you observe that distinguish a female and male Ascaris?

Exterior Identification Examine the size of the ascaris. Females are usually wider around and grow to be 20-40 cm long, while males are usually thinner and grow to be 15-30 cm long. Examine the posterior end of the worm. Female worms are straight while males are hooked.

What is the excretory organ of Ascaris?

So, the correct answer is ‘Renette glands’.

Where is Ascaris lumbricoides found in the body?

Ascaris parasites live in the intestine. Ascaris eggs are passed in the feces (poop) of infected people. If an infected person defecates outside (for example, near bushes, in a garden, or in a field), or if the feces of an infected person is used as fertilizer, worm eggs are deposited on soil.

What are the clinical features of ascariasis?

In the intestines In mild or moderate ascariasis, the intestinal infestation can cause: Vague abdominal pain. Nausea and vomiting. Diarrhea or bloody stools.

What is life cycle of Ascaris lumbricoides?

Life Cycle: Upon reaching the small intestine, they develop into adult worms. Between 2 and 3 months are required from ingestion of the infective eggs to oviposition by the adult female. Adult worms can live 1 to 2 years.