A) planula
B) cysticercus
C) rhabditiform
D) wriggler
Correct Answer: A
Solution :
Coelenterata (coelom + enteron) or phylum Cnidaria shows both sexual and asexual reproduction. The larval stages and Planula (Obelia) and Ephyra (Aurelia). Cysticercus (bladderworm) is the third larval stage seen in raeni'a besides oncosphere, hexacanth (other two larval stages). Cysticercus is seen after the hexacanth is released in the stomach of pig. Which, goes through blood circulation and on reaching muscles get encysted in the form of bladder worm. Rhabditi form is the first larval stage in Ascaris, which is formed within 10-14 days. It is non-infective juvenile stage, which rests for a week and completes first moult within egg and becomes second stage rhabditi form larva, which is infective. The larva is called rhabditi form or rhabditoid because of its close resemblance with Rhabditis. Wriggler is the larva of mosquito. It is free-swimming, active, aquatic larva performing wriggling movements. It has a life-span of 3-4 days.
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