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Question
Which one of the following set is the correct sequence of larval stages in the life cycle of Fasciola?
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Solution
The correct option is C Miracidium - sporocyst - redia - cercaria - metacercaria
Miracidia are pyriform motile larval stages which are about 150-200 m long and covered with cilia. Sporocysts are pleomorphic sac-like bodies which are about 0.3-1.5 mm in diameter containing germinal cells which give rise to small rediae (embryos). Mature cercariae about 0.5 mm long and are free-swimming gymnocephalus stages with simple elongate club-shaped tails, which are subsequently shed when they encyst on vegetation to form membrane-bound metacercariae about 0.2 mm in diameter. Thus, the correct answer is option C.
Miracidia are pyriform motile larval stages which are about 150-200 m long and covered with cilia. Sporocysts are pleomorphic sac-like bodies which are about 0.3-1.5 mm in diameter containing germinal cells which give rise to small rediae (embryos). Mature cercariae about 0.5 mm long and are free-swimming gymnocephalus stages with simple elongate club-shaped tails, which are subsequently shed when they encyst on vegetation to form membrane-bound metacercariae about 0.2 mm in diameter.
Thus, the correct answer is option C.
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