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30/08/2020 6:06 pm
Topic starter
The places of first, second and third moulting of Ascaris larva are
(a) soil, alveoli, lung
(b) liver, soil, stomach
(c) soil, lung, liver
(d) soil, intestine, lung
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30/08/2020 6:07 pm
(a) soil, alveoli, lung
Explanation:
The rhabditoid larva moults within egg shell in soil to form second stage rhabditoid (capable of infection). Egg hatches in the intestine, bores through epithelium of intestine to enter the circulatory system and then it reaches alveoli where it moults for the second time. After its 3rd moult, it leaves the lungs through trachea.