JCECE Medical JCECE Medical Solved Paper-2015

  • question_answer Assertion [A] Power of locomotion is poor in Ascans. Reason [R] The body wall of Ascaris has cuticle, but lacks circular muscles.

    A)  Both A and R true and R is the correct explanation of A.

    B)  Both A and R true, but R is not the correct explanation of A.

    C)  A is true, R is false.

    D)  Both A and R are false.

    Correct Answer: A

    Solution :

     In Ascaris, locomotion is poor because their body wall lack circular muscles. Ascaris (round worms) consitute the phylum-Aschelminthes. They may be free-living, aquatic and terrestrial or parasitic in plants and animals. In Ascaris, the epidermis is either a syncytium or a single layer of cells and is covered by a thick collagenous cuticle. The cuticle is often of complex structure and may have two or three distinct layers. Underneath the epidermis lies a layer of longitudinal muscle cells. The relatively rigid cuticle works with the muscles to create a hydroskeleton as they lack circumferential muscles.

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