Vivipary in endoparasites is exhibited by

Trichenella

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Ascaris

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Planaria

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Liverfluke

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Solution

The correct option is A Trichenella
Planaria is a free-living Platyhelminth. Trichenella, Ascaris and Liverfluke (Fasciola) are endoparasites which lives inside the host cell.
Trichenella and Ascaris are round-worms and belong to phylum Aschelminthes. Liverfluke is a flat-worm and belong to phylum Platyhelminthes.
Trichenella gives birth to its young ones and hence, it shows vivipary. Ascaris and Liverfluke lay eggs and are hence, oviparous.

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