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Question
In which of the following classes, polymorphism is very distinct?
In which of the following classes, polymorphism is very distinct?
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Solution
The correct option is B Hydrozoa
The phenomenon of occurrence of more than one type of individuals in their colonies performing different functions is called polymorphism. Polymorphism is seen in class Hydrozoa of phylum coelenterata such as in Obelia. Obelia shows trimorphic colony having three kinds of zooids: Polyps, blastostyles and medusae. Polyps are nutritive zooids which provide food to the colony. Blastostyles are budding zooids which give rise to medusae by budding and medusae are sexual zooids which have testes or ovaries to produce gametes and take part in sexual reproduction. Thus, the correct answer is option B.
The phenomenon of occurrence of more than one type of individuals in their colonies performing different functions is called polymorphism. Polymorphism is seen in class Hydrozoa of phylum coelenterata such as in Obelia. Obelia shows trimorphic colony having three kinds of zooids: Polyps, blastostyles and medusae. Polyps are nutritive zooids which provide food to the colony. Blastostyles are budding zooids which give rise to medusae by budding and medusae are sexual zooids which have testes or ovaries to produce gametes and take part in sexual reproduction.
Thus, the correct answer is option B.
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