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
Sea gulls excrete excess of NaCl from
liver
lungs
nasal activity
kidney
C.
nasal activity
Sea gulls have salt glands which excrete large loads of salt taken with their food and with the water they drink. Sea water contains 3% salt which is three times saltier than a bird's body fluid.
Salt glands are located above each eye and consists of several lobes arranged parallely. Salts are secreted into many radially arranged tubules then flows into a central canal that leads into the nose.
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