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Diversity In Living Organisms — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceDiversity In Living Organisms3 Marks
Question

Write down four characters of Chondrichthyes. Give two examples.

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Answer

  1. Marine fishes with completely cartilaginous endoskeleton are called chondrichthyes. They are generally large in size.
  2. Streamlined body is either laterally compressed or spindle-shaped or dorsoventrally flattened and disc shaped.
  3. Mouth is ventral in position.
  4. Skin is tough and covered with minute placoid scales.

Example: Scoliodon (dog fish) and Torpedo (electric ray).

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