In the cycle of Ascaris lumbricoides rhabditiform larva undergoes 2nd and 3rd moultings in

Options

A. liver
B. heart
C. alveoli of lungs
D. small intestine

Answer

A

Explanation

In the life cycle of Ascarie lumbricoides rhabditiform larvae is the infective stage of man. It reaches the alimentary canal through contaminted food and water In the small intestine, the shell gets dissolved to release 2nd stage larva.
Now, it reaches liver through the hepatic portal vein and then heart through post vena cava vein . It goes to lungs through the pulmonary arteries. In the alveoli of lungs it undergoes to 2nd moulting and produces the 3rd moulting in the alveoli only and then enters the small intestine again. In the small intestine, it undergoes 4th and 5th moulting to become a young one attaining sexual maturity with 8-10 weeks.