Question
The body of Rohu fish is covered by
cycloid scale, but the tail of homocercal
placoid scale, but the tail of heterocercal
cycloid scale, but the tail of heterocerca
placoid scale, but the tail is homocercal
Solution
A.
cycloid scale, but the tail of homocercal
Rohu (Labeo rohita) is a carp, which belongs to Class- Osteichytes (bony fishes). The body of rohu or exoskeleton is covered with dermal scales like cycloid scale and the tail fin is always homocercal type (i.e., has equal lobes) or diphycercal type while, the cartilaginous fishes such as Scoliodon has tough skin containing minute placoid scales and the tail fin is heterocercal type (i.e., has unequal lobes).
