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  1. Most fish do not sink in water because of the presence of:
    I. swim bladder
    II. air bladder
    III. air sacs
    IV. air in spongy bones

    2. A.

     I and II are correct
    B.

     II and III are correct
    C.

     III and IV are correct
    D.

     I, II, III and IV are correct

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    Answer : Option A

    Explanation :

    Fishes have a swim bladder or air bladder which helps them to remain buoyant without sinking in water. They are present in the body cavity.

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