Coelentrates have hydrostatic skeletion except:
Correct answer: A. Coral
- A. Coral
- B. Sea anemone
- C. Hydra
- D. Jellyfish
Explanation
Corals are unique among coelenterates because they secrete a hard exoskeleton made of calcium carbonate (CaCO3), which is distinct from the hydrostatic skeleton found in other coelenterates like sea anemones, hydras, and jellyfish. These other organisms use fluid pressure within their bodies to maintain shape and support movement. Thus, corals are the exception to the typical hydrostatic skeleton seen in this group.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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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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