The most appropriate term to describe the life cycle of Obelia is:
Correct answer: C. Metagenesis
- A. Metamorphosis
- B. Neoteny
- C. Metagenesis
- D. All of these.
Explanation
Obelia belong to the Phylum Coelenterata. In Obelia, the lifecycle includes two clearly defined phases i.e a fixed polypoid phase (hydroid colony) and a pelagic medusoid phase. Hydroid colony has no gonads and reproduces by asexual budding to give rise to medusae. On the other hand, medusae reproduce exclusively a by sexual method (ova and sperms) to give rise to new hydroid colonies. This fact apparently seems to have given rise to the idea of alternation of generations, also called metagenesis.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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