A) cycloid scale, but the tail of homocercal
B) placoid scale, but the tail of heterocercal
C) cycloid scale, but the tail of heterocercal
D) ptecoid scale, but the tail is homocercal
Correct Answer: A
Solution :
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).
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