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NEET Biology Animal Kingdom Question Bank Critical Thinking

  • question_answer
    Fishes having swim bladder, which do not have direct communication with the exterior and where resorbent and secretory part is not sharply separated from one another are called as [MP PMT 2002]

    A) Physostomes

    B) Physoclists

    C) Euphysoclists

    D) Paraphysoclists

    Correct Answer: B

    Solution :

    Two type of air bladders are known. In the more generalized groups of teleosts, the air bladder retains connection with the gut via a pneumatic duct, just as in ganoids and dipnoi. Such an open air bladder is called physostomous. In the teleost Erythrinus the air bladder has a lateral attachment to gut. Such as closed or ductless air bladder is called physoclistous.


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