2. Sample Papers
  3. 7th Class
  4. Science

7th Class Science Sample Paper Science Olympiad Model Test Paper-19

  • question_answer
    Exchange of gases between the air and blood takes place across the walls of ______.

    A) Bronchiole

    B) Diaphragm

    C) Alveoli

    D) Trachea

    E) None of these

    Correct Answer: C

You need to login to perform this action.
You will be redirected in 3 sec spinner