Multiple Choice QuestionsChondrichthyes is characterised by
Placoid scale
Ventral mouth
Ctenoid scale and ventral mouth
Placoid scale and ventral mouth
Animals of class-Mammalia have
Seven cervical vertebrae
Seven cranial nerve
Single ventricular chamber
Fourteen cervical vertebrae
Tube feet is the locomotory organ in
starfish
jelly fish
silver fish
Scoliodon
A.
starfish
Tube feet are extensible tubular processes bearing suckers and present in rows on the under surface of Echinoderms. These are connected internally with water vascular system. Each tube foot has an ampulla, a podium and a sucker. These are sensory structures that take part in adhesion, locomotion, respiration and food capturing.
Jelly fish is a member of Phylum- Coelenterata. Scoiliodon is a fish and silver fish is an arthropod.
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