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Animal Kingdom

Question
CBSEENBI11003001
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Chondrichthyes is characterised by

  • Placoid scale

  • Ventral mouth

  • Ctenoid scale and ventral mouth

  • Placoid scale and ventral mouth

Solution

D.

Placoid scale and ventral mouth

Chondrichthyes is one of the classes of super-class-Pisces, sub-phylum-Vertebrata and phylum Chordata. The members of class-Chondrichthyes are marine animals with a streamlined body and have a cartilaginous endoskeleton. Mouth is located ventrally. The skin is tough, containing minute placoid scales. The teeth are modified placoid scales which are backwardly directed, e.g., Dog fish (Scoliodon), sawfish (Pristis), great white shark (Carcharodorus sting ray (Trygon), etc.

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