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GK QUESTION#3882

Which of the following statements most accurately describes the Cyclostomata group?

  1. ATheir skin is covered with scales/plates and their hearts have only two chambers.
  2. BThey are ectothermic animals having mucus glands in the skin, and a three-chambered heart.
  3. CThey are warm-blooded, oviparous, bipedal, feathered, winged and toothless vertebrates.
  4. DThey are characterised by having an elongated eel-like body, circular mouth, slimy skin and are scaleless.Correct answer
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Answer

D. They are characterised by having an elongated eel-like body, circular mouth, slimy skin and are scaleless.

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Explanation

Cyclostomes are jawless vertebrates with elongated bodies and scaleless skin. The circular oral-disc description especially fits lampreys; hagfish have a different mouth apparatus. Not all cyclostomes migrate to freshwater or die after spawning.

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