Question

mention alteration of generation in coelenterates with example​

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In coelenterates; two types of individuals exist, a fixed polyp and a free medusa. These two forms (polyp and medusa) alternate successively where the polyp reproduce asexually to form a large number of medusa, each medusa reproduce sexually by the union of eggs and sperms to form zygote.The fern is an example of alternation of generations, in which both a multicellular diploid organism and a multicellular haploid organism occur and give rise to the other.