Question

The first, second and third moulting of Ascaris larvae occur in

• A. soil, alveoli and lung
• B. liver, soil and stomach
• C. soil, lung and liver
• D. soil, lung and intestine

Answer 1

The correct option is D soil, lung and intestine

Ascaris is a monogenetic parasite affecting humans. It causes the disease called ascariasis.

Moulting is a feature of nematodes that allows growth. Moulting is required as they are covered by a thick cuticle that does not permit growth.

Usually 4 moults occur during its life cycle.

• 1st moulting - soil
• 2nd and 3rd moulting - lung
• 4th moulting - Intestine