A) Cnidaria
B) Aschelminthes
C) Cephalopoda
D) Turbelaria
Correct Answer: A
Solution :
For a long time cnidarians and ctenophores were grouped together in the phylum Coelenterata because these are similar in general appearance, but now Ctenophora become a new phylum. Aschelminthes (Nemathelminthes) are commonly known as round worms. They occur almost every where in soil, freshwater, salt water and as parasite on animals and plants. Turbelaria is a class of phylum Platyhelminthes. These are mostly free-living but some are commensals and ectoparasites. Cephalopoda is a class of phylum-Mollusca. the cephalopods are head footed, bilaterally symmetrical and contain mantle.
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