2. Questions Bank
  3. 7th Class
  4. Science
  5. Respiration in Organisms

7th Class Science Respiration in Organisms Question Bank Respiration In Plants And Animals

  • question_answer
    ______ prevents collapsing of trachea.

    A) diaphragm                  

    B) ribs

    C) muscles                       

    D) cartilaginous rings

    Correct Answer: D

    Solution :

    cartilaginous rings


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