Teeth are modified ________ scales which are backwardly directly - Vidyadip

MCQ

Teeth are modified ________ scales which are backwardly directly

A
Ctenoid
B
Cycloid
✓
Placoid
D
Ganoid

✓

Answer

Correct option: C.

Placoid

c
In cartilaginous fishes (chondrichthyes), placoid scales are modified into teeth which are backwardly directed.

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