First slide

Classification of Animals

Question

Select the option that correctly matches a characteristic feature with the group of three animals.

Moderate

A

Tracheae - Scorpion, silkworm, squid
B

CaCo₃ Ossicles - Sea urchin, sea lily, sea hare
C

Stomochord - Balanoglossus, Saccoglossus, Limulus
D

Radula - Snail, squid, chiton

Solution

Snail, squid and chiton are molluscs. They have a file-like rasping organ called radula in the buccal cavity. Calcareous ossicles are absent in sea hare (Aplysia, a mollusc). Scorpion respires by book lungs. Squid respires by gills. Stomochord is present in hemichordates; not in Limulus (arthropod).

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