Question

Life span of Ascaris is
A. 3 to 6 months
B. 9 to 12 months
C. 1 year
D. 2 to 5 months

Answer 1

Hint: Ascaris is an intestinal parasite. They are endoparasites. They occur as free living animals or as facultative or obligate parasites of plants and animals. They have the lifespan of 10 months to 2 years and then they are passed in the stool.

Complete answer:
Ascaris lumbricoides is also known as common roundworm. The body is long, cylindrical, fusiform (pointed at both the ends). Its larvae and adult worms live in the small intestine and can cause intestinal disease.Ascaris belongs to phylum Nematoda. These are triploblastic and pseudocoelomate. They have a lifespan of 9 to 12 months. The infection of the small intestine caused by Ascaris lumbricoides is known as Ascariasis. Infection happens when a human swallows water or food contaminated with unhatched eggs, which hatch into juveniles in the duodenum. A female produces approximately 200,000 eggs per day which are passed with the feces. Moulting occurs 4 times that means they develop 4 times. It is most common in places without modern sanitation. People get the parasite through unsafe food and water. The infections usually cause no symptoms, but a high number of roundworms can lead to problems in the lungs or intestines. Systems become more noticeable when the roundworm infestation grows. Children often become infected when they put their hands in their mouths after playing in contaminated soil. Ascaris can also be passed directly from person to person.

So, the correct answer is option B.

Note: Ascaris lumbricoides is the large roundworm of humans. It is the most common parasitic worm in humans. Adult worms live in the small intestine up to 1 year. The eggs can be found in soil contaminated by human feces or uncooked food contaminated by soil that contains roundworm eggs.