NEET Sample Paper NEET Sample Test Paper-51

  • question_answer Which of the following is common to both avian and mammalian development?

    A) Primitive streak

    B) Trophoblast

    C) Holoblastic cleavage       

    D) Yolk plug

    Correct Answer: A

    Solution :

    In both birds and mammals during gastrula stage, certain cells of embryonic disc in its median line area, rapidly proliferate and migrate inward, forming a thick band of cells called - Primitive streak cells from this streak fan out laterally, forming a distinct cell layer between the surface layer (ectoderm) and endoderm. This layer is the mesoderm

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