Multiple choice

Which of the following animals has rhabditiform larva in its life cycle?

  1. Ascaris

  2. Liverfluke

  3. Hydra

  4. Taenia
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A Correct answer
Explanation

Ascaris (roundworm) has a rhabditiform larval stage in its life cycle. The rhabditiform larva is an early developmental stage with a muscular esophagus characteristic of many nematodes. The other organisms listed do not have rhabditiform larvae: Liver fluke (Trematoda) has miracidium, sporocyst, redia, and cercaria stages; Hydra (Cnidaria) has a planula larva; Taenia (Cestoda) has a hexacanth (oncosphere) larva.

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