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Class Chondrichthyes

Which of the ...

Question

Which of the following characters does not belong to fishes?

A

Four chambered heart

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B

Exoskeleton of scales and mesonephric kidneys

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C

Ten pairs of cranial nerves

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D

Respiration by gills

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Solution

The correct option is A Four chambered heart
Fishes are the aquatic vertebrates that live in water. They have stream lined for swimming with the help of tail. They have fins that help in balancing during swimming. Their body is covered by dermal scales. The scales provide them protection. Scales of fishes arise from the dermis layer hence are deep-seated. They respire with the help of gills. Fishes have a two-chambered heart and there is a single circulation of blood.

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