Alternation of generation is absent in which coelentrate?
Correct answer: C. Hydra
- A. Obelia
- B. Jellyfish
- C. Hydra
- D. Sea anemone
Explanation
Option C is correct since hydra only exhibits asexual reproduction by budding. As there is no sexually reproductive stage, alternation of generation is not possible. Alternation of a generation refers to the production of asexual form by sexual form and vice versa.Option A is incorrect since Obelia belongs to the class Hydrozoa in which both polypoid and medusoid forms show alternation of generation.Option B is incorrect since Jellyfish belongs to the class Scyphozoa and also consist of both sexual and asexual forms.Option D is incorrect since Sea Anemone also exhibits alternation of generation.
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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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