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Chondrichthyes can be differentiated from osteichthyes externally by
Chondrichthyes can be differentiated from osteichthyes externally by
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The correct option is D Ventral mouth
Cartilaginous fishes (Chondrichthyes) possess naked gills (no operculum), while bony fishes (Osteichthyes) have gills covered with operculum. Chondrichthyes mostly have a heterocercal tail, that is, both the lobes of the tail are not similar in size; the dorsal lobe is often larger than the ventral lobe. Osteichthyes typically have a homocercal fin, in which the tail lobes externally appear symmetrical. This happens as a result of the differences in internal skeletal structures. Cartilaginous fishes have a ventral mouth, while bony fishes have a terminal mouth. The number of chambers in the heart is two in all fishes.
Ventral mouth
Cartilaginous fishes (Chondrichthyes) possess naked gills (no operculum), while bony fishes (Osteichthyes) have gills covered with operculum. Chondrichthyes mostly have a heterocercal tail, that is, both the lobes of the tail are not similar in size; the dorsal lobe is often larger than the ventral lobe. Osteichthyes typically have a homocercal fin, in which the tail lobes externally appear symmetrical. This happens as a result of the differences in internal skeletal structures. Cartilaginous fishes have a ventral mouth, while bony fishes have a terminal mouth. The number of chambers in the heart is two in all fishes.
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