From the following specifications, identify the phylum to which the animal belongs.
Triploblastic unsegmented, acoelomate, exhibiting bilateral symmetry and reproducing both asexually and sexually, and having parasitic forms.
A
Porifera
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B
Platyhelminthes
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C
Annelida
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D
Ctenophora
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E
Cnidaria
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Solution
The correct option is B Platyhelminthes The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental cell layers) are the platyhelminths. These flatworms have no body cavity or coelom. Their body is unsegmented. They reproduce either sexually or asexually. They have parasitic forms like liverflukes. So, option B is correct.