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Metagenesis refers to

(a) occurrence of a drastic change in form dur­ing post­embryonic development

(b) presence of a segmented body and parthe­nogenetic mode of reproduction

(c) presence of different morphic forms

(d) alternation of generation between asexual and sexual phases of an organism.
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Ans: (d) alternation of generation between asexual and sexual phases of an organism.

Sol: An alternation of generation between asexual and sexual phases of an organism is referred to as metagenesis. E.g. in Obelia (a coelenterate), polyps reproduce asexually and medusae reproduce sexually.

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