First slide

Classification of Animals

Question

Which of the following structures are modified placoid scales in Trygon?

Moderate

A

Electric organs
B

Teeth
C

Poison sting
D

Fins

Solution

Teeth are modified placoid scales which are backwardly directed among Chondricthyes (e.g., Trygon). Electric organs are modified dorsal muscles. Spine is a modification of the dorsal fin.

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