All of the following are characteristics of Chondrichthyes EXCEPT
Correct answer: D. operculum over gills
- A. heterocercal tail
- B. 5-7 pairs of gills
- C. cartilaginous endoskeleton
- D. operculum over gills
Explanation
Chondrichthyes do not possess an operculum over their gills like bony fish (Osteichthyes) do. Instead, their gills are exposed directly to the water, often through multiple slits on the sides of their bodies. These gill slits are supported by cartilaginous structures rather than bony opercula.
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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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