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JIPMER2011BotanyAnimal Kingdom

Chondrichthyes is characterised by

Options

  1. Aplacoid scale
  2. Bventral mouth
  3. Cctenoid scale and ventral mouth
  4. Dplacoid scale and ventral mouth

Correct answer

D. placoid scale and ventral mouth

Step-by-step solution

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 streamlined body and have cartilaginous endoskeleton. Mouth is located ventrally. The skin is tough, containing minute placoid scales. The teeth aremodified placoid scales which are backwardly directed, e.g., Dog fish (Scoliodon), saw fish (Pristis), great white shark (Carcharodon), sting ray (Trygon), etc.

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