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Question

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

A
Liver
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B
Heart
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C
Alveoli of lungs
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D
Small intestine
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Solution

The correct option is C Alveoli of lungs
Fertilized eggs of Ascaris are passed out from the host's body with its faeces into the soil where first larval moulting takes place. This larva does not have the power of infection. It becomes moulted into second stage larvae which infect the host through consumption of contaminated food and water. In the alveoli of lungs, it undergoes the 2nd moulting to produce the 3rd stage larva.
So, the correct answer is option C.

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