Question

Ascaris completes its life cycle in
(A) Only in man
(B) Man and sleep
(C) Man and mosquito
(D) Man and cow

Answer 1

Hint: Ascaris are the parasitic round intestinal worm that depends on the host for its growth and nutrition. Ascaris Lumbricoides is present in the intestine of the human causing the disease called ascariasis. Pigs are also affected by this nematode called Ascaris suum.

Complete Answer:
- The eggs of the ascaris may enter into the host body either through the food that is contaminated with the eggs or the hand which touches the contaminated places. These eggs move to the small intestine and settle there.
- After hatching, they develop into the complete roundworm. They undergo reproduction and again produce more eggs.
- These eggs move through the feces of the affected person and it goes to the external soil. From there it somehow ingested to the host organisms. These worms are generally called as the monogenetic parasites since they complete their whole life inside the single host body.
- In which the Ascaris Lumbricoids completes its full lifecycle in humans and the Ascaris suum in the pigs. Hence Ascaris complete their life cycle only in the man.

Thus, the option (A) is correct.

Note: The worms of the ascaris eat the food of the host and sometimes they may obstruct the gut of the host. The symptoms of the ascariasis are abdominal pain, vomiting, diarrhea, loss in the weight of the affected people. The loose stool contains the worms in it.