Metagenesis refers to (a) occurrence of a drastic change in form dur ing postembryonic development (b) presence of a segmented body and parthe nogenetic mode of reproduction (c) presence of different morphic forms (d) alternation of generation between asexual and sexual phases of an organism.
Option D 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.
