First slide

Classification of Animals

Question

In which one of the following, the genus name and its two characters are not correctly matched?

Moderate

A

Ascidia - (i) Pharyngeal gill-slits (ii) Retrogressive metamorphosis
B

Torpedo - (i) Electric organs (ii) Cycloid scales
C

Myxine - (i) Cartilaginous cranium (ii) Closed circulatory system
D

Crocodylus - (i) Scutes over the body (ii) Four-chambered heart

Solution

Torpedo has electric organs but have placoid scales (not cycloid scales).
Cycloid scales are found in bony fishes.

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