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NEET · Biology · STD 11 - 4. Animal kingdom

Choose the correct statement.

  1. A All mammals are viviparous.
  2. B All cyclostomes do not possess jaws and paired fins.
  3. C All reptiles have a three­chambered heart.
  4. D All pisces have gills covered by an operculum.
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Answer & Solution

Correct Answer

(B) All cyclostomes do not possess jaws and paired fins.

Step-by-step Solution

Detailed explanation

(b) : Ornithorhynchus and Tachyglossus are oviparous mammals. Crocodile is a reptile which possesses four chambered heart. In cartilaginous fish (except Chimaera) gills are not covered by an oper­ culum.